$\"\"$ $\"\"$

The equation is $\"\"$ .

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

$\"\"$

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

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

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

Check:

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

$\"\"$

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

The value of $\"\"$ .