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x in (-oo:+oo)
y = (10/1)*((10*x)/40) // - (10/1)*((10*x)/40)
y-((10/1)*((10*x)/40)) = 0
(-5/2)*x+y = 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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