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(3*x-15)/4-x = 1-(x/6) // - 1-(x/6)
(3*x-15)/4-x+x/6-1 = 0
(6*(3*x-15))/(4*6)+(4*6*(-x))/(4*6)+(4*x)/(4*6)+(-1*4*6)/(4*6) = 0
6*(3*x-15)+4*6*(-x)+4*x-1*4*6 = 0
4*x-6*x-90-24 = 0
-2*x-90-24 = 0
-2*x-114 = 0
(-2*x-114)/(4*6) = 0
(-2*x-114)/(4*6) = 0 // * 4*6
-2*x-114 = 0
-2*x-114 = 0 // + 114
-2*x = 114 // : -2
x = 114/(-2)
x = -57
x = -57
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