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x in (-oo:+oo)
(2/3)*y = 6*x // - 6*x
(2/3)*y-(6*x) = 0
(2/3)*y-6*x = 0
2/3*y-6*x = 0 // - 2/3*y
-6*x = -(2/3*y) // : -6
x = (-(2/3*y))/(-6)
x = 1/9*y
x = 1/9*y
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