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u in (-oo:+oo)
-11 = u/2-3 // - u/2-3
3-(u/2)-11 = 0
-1/2*u-8 = 0 // + 8
-1/2*u = 8 // : -1/2
u = 8/(-1/2)
u = -16
u = -16
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