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