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

The expression is $\"\"$ .

According to subtraction property of equality: Divide each side by negative one.

$\"\"$

$\"\"$ (Divide: $\"\"$ ) $\"\"$

Check:

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

$\"\"$

$\"\"$ (Product of two same signs is positive) $\"\"$

The value of $\"\"$ .