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u in (-oo:+oo)
-35 = (-7/3)*u // - (-7/3)*u
-((-7/3)*u)-35 = 0
(7/3)*u-35 = 0
7/3*u-35 = 0 // + 35
7/3*u = 35 // : 7/3
u = 35/7/3
u = 15
u = 15
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