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x in (-oo:+oo)
y = (-5/6)*x // - (-5/6)*x
y-((-5/6)*x) = 0
(5/6)*x+y = 0
5/6*x+y = 0 // - y
5/6*x = -y // : 5/6
x = -y/5/6
x = -6/5*y
x = -6/5*y
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