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t in (-oo:+oo)
22/10 = t/15 // - t/15
22/10-(t/15) = 0
11/5-1/15*t = 0 // - 11/5
-1/15*t = -11/5 // : -1/15
t = -11/5/(-1/15)
t = 33
t = 33
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