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x in (-oo:+oo)
(1/3)*y = (5/2)*x // - (5/2)*x
(1/3)*y-((5/2)*x) = 0
(-5/2)*x+(1/3)*y = 0
1/3*y-5/2*x = 0 // - 1/3*y
-5/2*x = -(1/3*y) // : -5/2
x = (-(1/3*y))/(-5/2)
x = 2/15*y
x = 2/15*y
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