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

The expression is $\"\"$ .

According to addition property of equality: Add 5 to each side.

$\"\"$

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

$\"\"$ (Add: 7 + 5 = 12) $\"\"$

Check:

Check the solution by substituting $\"\"$ in the original equation.

$\"\"$

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

The value of $\"\"$ .