22+5х=88+6х, 6х-5х=22-88, х=-66; -8х+45=-15-4х, -4х+8х=45+15, 4х=60, х= 15; -3х-17=8х-105, 8х+3х=-17+105, 11х= 88, х=8; 21-3у=2(у-3), 21-3у=2у-6, 2у+3у=21+6, 5у=27, у=5,4