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x in (-oo:+oo)
y = (250*x)/100-x // - (250*x)/100-x
x-((250*x)/100)+y = 0
(-5/2)*x+x+y = 0
y-3/2*x = 0 // - y
-3/2*x = -y // : -3/2
x = -y/(-3/2)
x = 2/3*y
x = 2/3*y
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