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x in (-oo:+oo)
2-((x-1)/3) = 4 // - 4
2-((x-1)/3)-4 = 0
(-1*(x-1))/3-4+2 = 0
(-1*(x-1))/3+(-4*3)/3+(2*3)/3 = 0
2*3-1*(x-1)-4*3 = 0
6-x-11 = 0
-x-5 = 0
(-x-5)/3 = 0
(-x-5)/3 = 0 // * 3
-x-5 = 0
-x-5 = 0 // + 5
-x = 5 // * -1
x = -5
x = -5
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