$\"\"$

The equation is $\"\"$ .

According to addition property of equality: if a = b, then a + c = b + c.

$\"\"$ (Add 11 to each side)

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

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

Check:

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

$\"\"$

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

The equality is true. $\"\"$

The value of $\"\"$ .