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x in (-oo:+oo)
y = (-13/4)*x // - (-13/4)*x
y-((-13/4)*x) = 0
(13/4)*x+y = 0
13/4*x+y = 0 // - y
13/4*x = -y // : 13/4
x = -y/13/4
x = -4/13*y
x = -4/13*y
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