$\"\"$

The equation is $\"\"$ .

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

$\"\"$ (Add 4 to each side)

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

Check:

To verify the solution, substitute $\"\"$ in original equation.

$\"\"$

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

The value of $\"\"$ .