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u in (-oo:+oo)
-7/3 = (-7/2)*u-(7/5) // - (-7/2)*u-(7/5)
7/5-((-7/2)*u)-7/3 = 0
(7/2)*u-7/3+7/5 = 0
7/2*u-14/15 = 0 // + 14/15
7/2*u = 14/15 // : 7/2
u = 14/15/7/2
u = 4/15
u = 4/15
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