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t in (-oo:+oo)
20/22 = t/99 // - t/99
20/22-(t/99) = 0
10/11-1/99*t = 0 // - 10/11
-1/99*t = -10/11 // : -1/99
t = -10/11/(-1/99)
t = 90
t = 90
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