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