(5 х +2 х)*14=294 (12y-5y): 4=21 (19 х +6 х): 35=5 23421y-8y)=3

(5 х +2 х)*14=2947x*14=2947x=294:147x=21x=21:7x=3 (12y-5y): 4=217y: 4=217y=21*47y=84y=84:7y=12 (19 х +6 х): 35=525x: 35=525x=5*3525x=175x=175:25x=7 23421y-8y)=3234:13y=313y=234:313y=78y=78:3y=26