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x in (-oo:+oo)
(2/3)*y = 12*x // - 12*x
(2/3)*y-(12*x) = 0
(2/3)*y-12*x = 0
2/3*y-12*x = 0 // - 2/3*y
-12*x = -(2/3*y) // : -12
x = (-(2/3*y))/(-12)
x = 1/18*y
x = 1/18*y
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