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t in (-oo:+oo)
72*(t/60) = (60*(t+12))/60 // - (60*(t+12))/60
72*(t/60)-((60*(t+12))/60) = 0
72*(t/60)-t-12 = 0
1/5*t-12 = 0 // + 12
1/5*t = 12 // : 1/5
t = 12/1/5
t = 60
t = 60
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