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