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x in (-oo:+oo)
Y = (3/8)*x // - (3/8)*x
Y-((3/8)*x) = 0
Y+(-3/8)*x = 0
Y-3/8*x = 0 // - Y
-3/8*x = -Y // : -3/8
x = -Y/(-3/8)
x = 8/3*Y
x = 8/3*Y
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