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(1/4)*(x+12)-18 = 7 // - 7
(1/4)*(x+12)-18-7 = 0
1/4*(x+12)-18-7 = 0
1/4*(x+12)-18-7 = 0
1/4*x-15-7 = 0
1/4*x-22 = 0
1/4*x-22 = 0
1/4*x-22 = 0 // + 22
1/4*x = 22 // : 1/4
x = 22/1/4
x = 88
x = 88
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