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