$\"\"$

The equation is $\"\"$ .

Subtract 7 from each side.

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

$\"\"$

Multiply each side by negative 1.

$\"\"$ .

The solution of $\"\"$ .

$\"\"$

Check:

Substitute the value $\"\"$ in $\"\"$ .

$\"\"$ \ \

$\"\"$

$\"\"$ .

Since the above statement is true, $\"\"$ is a solution of $\"\"$ .

$\"\"$

The solution of $\"\"$ is $\"\"$ .