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u in (-oo:+oo)
7/11 = u/12 // - u/12
7/11-(u/12) = 0
7/11-1/12*u = 0 // - 7/11
-1/12*u = -7/11 // : -1/12
u = -7/11/(-1/12)
u = 84/11
u = 84/11
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