$\"\"$

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The equation is $\"\"$ .

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The matrices have the same dimensions and the corresponding elements are equal.

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The equality can be written as a two linear equations

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$\"\"$ Equation (1)

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$\"\"$ Equation (2) $\"\"$

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The first equation is $\"\"$ .

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Apply subtraction property of equality: if a = b, then $\"\"$ .

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$\"\"$ (Subtract 2x from each side)

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Apply commutative property of addition: a + b = b + a.

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$\"\"$

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$\"\"$ (Apply Additive inverse property: $\"\"$ ) $\"\"$

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The second equation is $\"\"$ .

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$\"\"$ (Replace $\"\"$ in first equation 2)

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Distribute terms using distributive property: $\"\"$ .

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$\"\"$

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$\"\"$ (Multiply: $\"\"$ and $\"\"$ )

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Combine like terms using distributive property: $\"\"$ .

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$\"\"$

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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Apply addition property of equality: if $\"\"$ , then $\"\"$ .

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$\"\"$ (Add 15 to each side)

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$\"\"$ (Apply Additive inverse property: $\"\"$ )

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$\"\"$ (Apply Additive identity property: $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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Apply division property of equality; if $\"\"$ , then $\"\"$ .

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$\"\"$ (Divide each side by 7)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$ (Replace x = 4 in equation $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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The solution is $\"\"$ .