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