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x in (-oo:+oo)
y = (-9/8)*x // - (-9/8)*x
y-((-9/8)*x) = 0
(9/8)*x+y = 0
9/8*x+y = 0 // - y
9/8*x = -y // : 9/8
x = -y/9/8
x = -8/9*y
x = -8/9*y
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