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x in (-oo:+oo)
Y = 9*x-((2/3)*x) // - 9*x-((2/3)*x)
Y-(9*x)+(2/3)*x = 0
Y-9*x+(2/3)*x = 0
Y-25/3*x = 0 // - Y
-25/3*x = -Y // : -25/3
x = -Y/(-25/3)
x = 3/25*Y
x = 3/25*Y
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