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