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(x+3*x-4-2)/2 = x+6 // - x+6
(x+3*x-4-2)/2-x-6 = 0
(4*x-6)/2-x-6 = 0
(4*x-6)/2+(2*(-x))/2+(-6*2)/2 = 0
4*x+2*(-x)-6*2-6 = 0
2*x-12-6 = 0
2*x-18 = 0
(2*x-18)/2 = 0
(2*x-18)/2 = 0 // * 2
2*x-18 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x = 9
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