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u in (-oo:+oo)
8/11 = u/4 // - u/4
8/11-(u/4) = 0
8/11-1/4*u = 0 // - 8/11
-1/4*u = -8/11 // : -1/4
u = -8/11/(-1/4)
u = 32/11
u = 32/11
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