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

The given equation $\"\"$ .

According to subtraction property of equality: if $\"\"$ , then $\"\"$ .

$\"\"$ (Subtract 7.1 from each side)

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

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

Check:

To check solution Substitute $\"\"$ value in original equation.

$\"\"$

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

The value of $\"\"$ .