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u in (-oo:+oo)
9/12 = u/8 // - u/8
9/12-(u/8) = 0
3/4-1/8*u = 0 // - 3/4
-1/8*u = -3/4 // : -1/8
u = -3/4/(-1/8)
u = 6
u = 6
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