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t in (-oo:+oo)
18/22 = t/99 // - t/99
18/22-(t/99) = 0
9/11-1/99*t = 0 // - 9/11
-1/99*t = -9/11 // : -1/99
t = -9/11/(-1/99)
t = 81
t = 81
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