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(3/4)*(x-5) = 12 // - 12
(3/4)*(x-5)-12 = 0
3/4*(x-5)-12 = 0
3/4*(x-5)-12 = 0
3/4*x-63/4 = 0
3/4*x-63/4 = 0
3/4*x-63/4 = 0 // + 63/4
3/4*x = 63/4 // : 3/4
x = 63/4/3/4
x = 21
x = 21
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