$\"\"$ \ \

The equation is $\"\"$

According to subtraction property of equality: If a = b then a – c = b – c.

$\"\"$ (Subtract 2a from each side)

$\"\"$ (Apply commutative property)

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

$\"\"$ (Subtract 4 from each side)

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

$\"\"$

Verify:

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

$\"\"$

$\"\"$ (Multiply: $\"\"$ )

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

$\"\"$ \ \

The value of $\"\"$ .