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