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u in (-oo:+oo)
5/7 = u/13 // - u/13
5/7-(u/13) = 0
5/7-1/13*u = 0 // - 5/7
-1/13*u = -5/7 // : -1/13
u = -5/7/(-1/13)
u = 65/7
u = 65/7
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