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x in (-oo:+oo)
Y = (4/3)*x // - (4/3)*x
Y-((4/3)*x) = 0
Y+(-4/3)*x = 0
Y-4/3*x = 0 // - Y
-4/3*x = -Y // : -4/3
x = -Y/(-4/3)
x = 3/4*Y
x = 3/4*Y
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