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