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(3*x-15)/4 = 2*x // - 2*x
(3*x-15)/4-(2*x) = 0
(3*x-15)/4-2*x = 0
(3*x-15)/4+(-2*4*x)/4 = 0
3*x-2*4*x-15 = 0
-5*x-15 = 0
(-5*x-15)/4 = 0
(-5*x-15)/4 = 0 // * 4
-5*x-15 = 0
-5*x-15 = 0 // + 15
-5*x = 15 // : -5
x = 15/(-5)
x = -3
x = -3
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