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