$\"\"$ $\"\"$

The equation is $\"\"$ .

Apply subtraction property of equality: Subtract 10x from each side

$\"\"$

Rearrange the terms using commutative property of addition: a+b = b+a.

$\"\"$

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

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

$\"\"$

$\"\"$ (Substitute x = 3)

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

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

$\"\"$

The value of $\"\"$ .