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x in (-oo:+oo)
y = (13/5)*x // - (13/5)*x
y-((13/5)*x) = 0
(-13/5)*x+y = 0
y-13/5*x = 0 // - y
-13/5*x = -y // : -13/5
x = -y/(-13/5)
x = 5/13*y
x = 5/13*y
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