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