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