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