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(1/4)*(x+12)-8 = 7 // - 7
(1/4)*(x+12)-8-7 = 0
1/4*(x+12)-8-7 = 0
1/4*(x+12)-8-7 = 0
1/4*x-7-5 = 0
1/4*x-12 = 0
1/4*x-12 = 0
1/4*x-12 = 0 // + 12
1/4*x = 12 // : 1/4
x = 12/1/4
x = 48
x = 48
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