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(1/3)*(18+27) = 6*(x-4)+12 // - 6*(x-4)+12
(1/3)*(18+27)-(6*(x-4))-12 = 0
(1/3)*(18+27)-6*(x-4)-12 = 0
15-6*(x-4)-12 = 0
15-6*(x-4)-12 = 0
39-6*x-12 = 0
27-6*x = 0
27-6*x = 0
27-6*x = 0 // - 27
-6*x = -27 // : -6
x = -27/(-6)
x = 9/2
x = 9/2
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