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x in (-oo:+oo)
Y = (10/4)*x // - (10/4)*x
Y-((10/4)*x) = 0
Y+(-5/2)*x = 0
Y-5/2*x = 0 // - Y
-5/2*x = -Y // : -5/2
x = -Y/(-5/2)
x = 2/5*Y
x = 2/5*Y
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