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x in (-oo:+oo)
(2/3)*y = (1/2)*x // - (1/2)*x
(2/3)*y-((1/2)*x) = 0
(-1/2)*x+(2/3)*y = 0
2/3*y-1/2*x = 0 // - 2/3*y
-1/2*x = -(2/3*y) // : -1/2
x = (-(2/3*y))/(-1/2)
x = 4/3*y
x = 4/3*y
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