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