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t in (-oo:+oo)
((51/5)/61)/6 = (t/71)/7 // - (t/71)/7
((51/5)/61)/6-((t/71)/7) = 0
(-1/497)*t+((51/5)/61)/6 = 0
17/610-1/497*t = 0 // - 17/610
-1/497*t = -17/610 // : -1/497
t = -17/610/(-1/497)
t = 8449/610
t = 8449/610
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