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x in (-oo:+oo)
y = (-5/7)*x // - (-5/7)*x
y-((-5/7)*x) = 0
(5/7)*x+y = 0
5/7*x+y = 0 // - y
5/7*x = -y // : 5/7
x = -y/5/7
x = -7/5*y
x = -7/5*y
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