$\"\"$

The equation is $\"\"$ .

Apply subtraction property of equality: Subtract 3.5 form each side.

$\"\"$

$\"\"$ (Additive inverse property: $\"\"$ )

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

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

$\"\"$

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

The equation is true.

$\"\"$

$\"\"$ .