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(1/8)*(x+12) = 3 // - 3
(1/8)*(x+12)-3 = 0
1/8*(x+12)-3 = 0
1/8*(x+12)-3 = 0
1/8*x-3/2 = 0
1/8*x-3/2 = 0
1/8*x-3/2 = 0 // + 3/2
1/8*x = 3/2 // : 1/8
x = 3/2/1/8
x = 12
x = 12
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