$\"\"$

\

The equation is $\"\"$ .

\

Subtraction property of equality: if $\"\"$ , then $\"\"$ .

\

$\"\"$ (Subtract 7 from both sides)

\

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

\

$\"\"$ (Subtract: $\"\"$ . Add: $\"\"$ )

\

$\"\"$

\

Division property of equality:

\

For any real numbers a, b and c, with $\"\"$ , if $\"\"$ then $\"\"$

\

$\"\"$ (Divide each side by 5)

\

$\"\"$

\

$\"\"$ (Cancel equal terms)

\

$\"\"$

\

Check:

\

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

\

$\"\"$

\

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

\

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

\

Compare the values, the equation is true. The solution is $\"\"$ .

\

$\"\"$

\

The solution is $\"\"$ .