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