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x in (-oo:+oo)
8*(x/2-12) = 3*x-81 // - 3*x-81
8*(x/2-12)-(3*x)+81 = 0
8*(x/2-12)-3*x+81 = 0
8*(1/2*x-12)-3*x+81 = 0
8*(1/2*x-12)-3*x+81 = 0
x-96+81 = 0
x-15 = 0
x-15 = 0
x-15 = 0 // + 15
x = 15
x = 15
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