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u in (-oo:+oo)
72/88 = u/11 // - u/11
72/88-(u/11) = 0
9/11-1/11*u = 0 // - 9/11
-1/11*u = -9/11 // : -1/11
u = -9/11/(-1/11)
u = 9
u = 9
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