The equation is .
Distribute terms using distributive property: .
(Multiply: )
Apply addition property of equality: If a = b then a + b = b + a.
(Apply additive inverse property: )
(Apply additive identity property: )
(Add: )
Apply division property of equality: If a = b then .
(Divide each side by 2)
(Cancel common terms)
(Divide: )
Check:
To check the solution, and substitute x = 12, in .
(Substitute )
(Subtract : )
(Multiply: )
The equation is true.
The solution of .
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