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x in (-oo:+oo)
y = (-7/2)*x // - (-7/2)*x
y-((-7/2)*x) = 0
(7/2)*x+y = 0
7/2*x+y = 0 // - y
7/2*x = -y // : 7/2
x = -y/7/2
x = -2/7*y
x = -2/7*y
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