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(1/4)*(3*x-12) = 21 // - 21
(1/4)*(3*x-12)-21 = 0
1/4*(3*x-12)-21 = 0
1/4*(3*x-12)-21 = 0
3/4*x-24 = 0
3/4*x-24 = 0
3/4*x-24 = 0 // + 24
3/4*x = 24 // : 3/4
x = 24/3/4
x = 32
x = 32
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