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x in (-oo:+oo)
(1/5)*y = 3*x // - 3*x
(1/5)*y-(3*x) = 0
(1/5)*y-3*x = 0
1/5*y-3*x = 0 // - 1/5*y
-3*x = -(1/5*y) // : -3
x = (-(1/5*y))/(-3)
x = 1/15*y
x = 1/15*y
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