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x in (-oo:+oo)
4*(x-8) = 120/10 // - 120/10
4*(x-8)-(120/10) = 0
4*(x-8)-12 = 0
4*(x-8)-12 = 0
4*x-44 = 0
4*x-44 = 0
4*x-44 = 0 // + 44
4*x = 44 // : 4
x = 44/4
x = 11
x = 11
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