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x in (-oo:+oo)
(x-3)/y = (2*x)/9 // - (2*x)/9
(x-3)/y-((2*x)/9) = 0
(x-3)/y+(-2/9)*x = 0
(x-3)/y+(-2*x)/9 = 0
(9*(x-3))/(9*y)+(-2*x*y)/(9*y) = 0
9*(x-3)-2*x*y = 0
9*x-2*x*y-27 = 0
9*x-2*x*y-27 = 0
-2*x*y-27 = 0 // + 27
-2*x*y = 27 // : -2*y
x = 27/(-2*y)
x+27/2*y^-1 = 0
(x+27/2*y^-1)/(9*y) = 0
(x+27/2*y^-1)/(9*y) = 0 // * 9*y
x+27/2*y^-1 = 0
x+27/2*y^-1 = 0 // - 27/2*y^-1
x = -(27/2*y^-1)
x = -27/2*y^-1
x = -27/2*y^-1
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