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t in (-oo:+oo)
69*(t/60) = 60*((t+11)/60) // - 60*((t+11)/60)
69*(t/60)-(60*((t+11)/60)) = 0
69*(t/60)-t-11 = 0
3/20*t-11 = 0 // + 11
3/20*t = 11 // : 3/20
t = 11/3/20
t = 220/3
t = 220/3
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