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u in (-oo:+oo)
3/8 = u/11 // - u/11
3/8-(u/11) = 0
3/8-1/11*u = 0 // - 3/8
-1/11*u = -3/8 // : -1/11
u = -3/8/(-1/11)
u = 33/8
u = 33/8
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