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(1/4)*(x+12)+4 = 21 // - 21
(1/4)*(x+12)-21+4 = 0
1/4*(x+12)-21+4 = 0
1/4*(x+12)-21+4 = 0
1/4*x-18+4 = 0
1/4*x-14 = 0
1/4*x-14 = 0
1/4*x-14 = 0 // + 14
1/4*x = 14 // : 1/4
x = 14/1/4
x = 56
x = 56
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