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u in (-oo:+oo)
8/13 = u/7 // - u/7
8/13-(u/7) = 0
8/13-1/7*u = 0 // - 8/13
-1/7*u = -8/13 // : -1/7
u = -8/13/(-1/7)
u = 56/13
u = 56/13
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