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x in (-oo:+oo)
-1/5 = x+3/5 // - x+3/5
-x-1/5-(3/5) = 0
-x-1/5-3/5 = 0
-x-4/5 = 0 // + 4/5
-x = 4/5 // * -1
x = -4/5
x = -4/5
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