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u in (-oo:+oo)
3/4 = u/100 // - u/100
3/4-(u/100) = 0
3/4-1/100*u = 0 // - 3/4
-1/100*u = -3/4 // : -1/100
u = -3/4/(-1/100)
u = 75
u = 75
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