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x in (-oo:+oo)
2*x-((2/3)*(x-1)) = 2*x-(2*(x+1)) // - 2*x-(2*(x+1))
2*(x+1)-((2/3)*(x-1))+2*x-(2*x) = 0
(-2/3)*(x-1)+2*(x+1)+2*x-2*x = 0
2*(x+1)-2/3*(x-1)+2*x-2*x = 0
2*(x+1)-2/3*(x-1)+2*x-2*x = 0
4/3*x+2*x-2*x+8/3 = 0
10/3*x-2*x+8/3 = 0
4/3*x+8/3 = 0
4/3*x+8/3 = 0
4/3*x+8/3 = 0 // - 8/3
4/3*x = -8/3 // : 4/3
x = -8/3/4/3
x = -2
x = -2
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