1)(11:14) - (7:10)-(21:100)-(13:14) = ((11-13):14) - ((70-21):100)=(-2:14) - (49:100) - ((200+686):1400)= -886:1400=-443:700
1)(11:14) - (7:10)-(21:100)-(13:14) = ((11-13):14) - ((70-21):100)=(-2:14) - (49:100) - ((200+686):1400)= -886:1400=-443:700