$\"\"$

The perimeter of a triangle is the sum of the measures of three sides.

So, $\"\"$ .

Solve for x.

$\"\"$ (Write the expression)

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

Apply subtraction property of equality: if $\"\"$ .

$\"\"$ (Subtract 25 from each side) $\"\"$ $\"\"$ (Apply additive inverse property: $\"\"$ )

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

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

The value of the x is 9. $\"\"$

The value of the x is 9.