$\"\"$

\

The equation is $\"\"$ .

\

$\"\"$ (Apply commutative property of addition: $\"\"$ ) \ \

\

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

\

$\"\"$ (Subtract 7 from each side)

\

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

\

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

\

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

\

$\"\"$ (Multiply each side by negative 1)

\

$\"\"$ (Product of two same signs is positive) \ \

\

$\"\"$ (Product of two different signs is negative) $\"\"$

\

Check:

\

To check the solution, substitute $\"\"$ in original equation.

\

$\"\"$

\

$\"\"$ (Product of two same signs is positive)

\

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

\

The statement is true. $\"\"$

\

The value of $\"\"$ .