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x in (-oo:+oo)
Y = (8/20)*x // - (8/20)*x
Y-((8/20)*x) = 0
Y+(-2/5)*x = 0
Y-2/5*x = 0 // - Y
-2/5*x = -Y // : -2/5
x = -Y/(-2/5)
x = 5/2*Y
x = 5/2*Y
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