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u in (-oo:+oo)
10/7 = -5*u // + -5*u
10/7-(-5*u) = 0
5*u+10/7 = 0
5*u+10/7 = 0 // - 10/7
5*u = -10/7 // : 5
u = -10/7/5
u = -2/7
u = -2/7
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