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