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t in (-oo:+oo)
73*(t/60) = 60*(t+15/60) // - 60*(t+15/60)
73*(t/60)-(60*(t+15/60)) = 0
73*(t/60)-60*(t+15/60) = 0
(73*t)/60-60*(t+1/4) = 0
(-60*60*(t+1/4))/60+(73*t)/60 = 0
73*t-60*60*(t+1/4) = 0
-3527*t-900 = 0
(-3527*t-900)/60 = 0
(-3527*t-900)/60 = 0 // * 60
-3527*t-900 = 0
-3527*t-900 = 0 // + 900
-3527*t = 900 // : -3527
t = 900/(-3527)
t = -900/3527
t = -900/3527
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