(720-t*6):9=60 уравнение
720-t*6=540
t*6=180
t=30
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720-t*6=60*9
720-t*6=540
t*6=720-540
t*6=180
t=180:6
t=30
(720-30*6):9=60
60=60
Verified answer
720-t*6=540
t*6=180
t=30