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(1/4)*(x-12) = 3/4 // - 3/4
(1/4)*(x-12)-(3/4) = 0
(1/4)*(x-12)-3/4 = 0
1/4*(x-12)-3/4 = 0
(1/4*4*(x-12))/4-3/4 = 0
1/4*4*(x-12)-3 = 0
x-15 = 0
(x-15)/4 = 0
(x-15)/4 = 0 // * 4
x-15 = 0
x-15 = 0 // + 15
x = 15
x = 15
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