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u in (-oo:+oo)
5/13 = u/10 // - u/10
5/13-(u/10) = 0
5/13-1/10*u = 0 // - 5/13
-1/10*u = -5/13 // : -1/10
u = -5/13/(-1/10)
u = 50/13
u = 50/13
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