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x in (-oo:+oo)
y = (-15/8)*x // - (-15/8)*x
y-((-15/8)*x) = 0
(15/8)*x+y = 0
15/8*x+y = 0 // - y
15/8*x = -y // : 15/8
x = -y/15/8
x = -8/15*y
x = -8/15*y
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