(1600+t)/80=60
(1600+t):80=60
1600+t=60*80
1600+t=4800
t=4800-1600
t=3200.
ПРОВЕРКА:(1600+3200):80=60, 4800:80=60, 60=60.
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(1600+t):80=60
1600+t=60*80
1600+t=4800
t=4800-1600
t=3200.
ПРОВЕРКА:(1600+3200):80=60, 4800:80=60, 60=60.