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u in (-oo:+oo)
7/2 = (-7/5)*u-(7/3) // - (-7/5)*u-(7/3)
7/2-((-7/5)*u)+7/3 = 0
(7/5)*u+7/2+7/3 = 0
7/5*u+35/6 = 0 // - 35/6
7/5*u = -35/6 // : 7/5
u = -35/6/7/5
u = -25/6
u = -25/6
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