$\"\"$

The equation is $\"\"$ .

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

$\"\"$ (Add 6 to each side)

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

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

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

Check:

To check the solution substitute the value of $\"\"$ in above equation.

$\"\"$

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

The equality is true. \ \ $\"\"$

The value of $\"\"$ .