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u in (-oo:+oo)
3/7 = u/13 // - u/13
3/7-(u/13) = 0
3/7-1/13*u = 0 // - 3/7
-1/13*u = -3/7 // : -1/13
u = -3/7/(-1/13)
u = 39/7
u = 39/7
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