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x in (-oo:+oo)
Y = (4/9)*x // - (4/9)*x
Y-((4/9)*x) = 0
Y+(-4/9)*x = 0
Y-4/9*x = 0 // - Y
-4/9*x = -Y // : -4/9
x = -Y/(-4/9)
x = 9/4*Y
x = 9/4*Y
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