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