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x in (-oo:+oo)
y = (5/8)*x // - (5/8)*x
y-((5/8)*x) = 0
(-5/8)*x+y = 0
y-5/8*x = 0 // - y
-5/8*x = -y // : -5/8
x = -y/(-5/8)
x = 8/5*y
x = 8/5*y
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