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x in (-oo:+oo)
3*x-(2/5) = x-2 // - x-2
3*x-x-(2/5)+2 = 0
3*x-x-2/5+2 = 0
2*x+8/5 = 0 // - 8/5
2*x = -8/5 // : 2
x = -8/5/2
x = -4/5
x = -4/5
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