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u in (-oo:+oo)
10 = (5*u)/7 // - (5*u)/7
10-((5*u)/7) = 0
(-5/7)*u+10 = 0
10-5/7*u = 0 // - 10
-5/7*u = -10 // : -5/7
u = -10/(-5/7)
u = 14
u = 14
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