$\"\"$

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The equation is $\"\"$ .

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Apply distributive property: $\"\"$ .

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$\"\"$

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

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

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Apply addition property of equality: Add 10a to each side.

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$\"\"$

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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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$\"\"$ (Add: 8a + 10a = 18a)

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

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$\"\"$ (Add 4 to each side)

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

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$\"\"$ (Add: 50 + 4 = 54)

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

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Apply division property of equality: Divide each side by 18.

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$\"\"$

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$\"\"$ (Cancel common terms)

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

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The value of $\"\"$ .