1. 2а²+8а-3а-12-5а²-10а+7а+14= -3а²+2а+2
2. 3х-3х²-5+5х+18х²+12х+21х+14= 15х²+41х+9
3. 12а²+4а-3а-1-6а²-14а+21а+49= 6а²+8а+48
4. 3х-5-6х²+10х+2х-3-6х²+9х= -12х²+24х-8
1. 2а²+8а-3а-12-5а²-10а+7а+14= -3а²+2а+2
2. 3х-3х²-5+5х+18х²+12х+21х+14= 15х²+41х+9
3. 12а²+4а-3а-1-6а²-14а+21а+49= 6а²+8а+48
4. 3х-5-6х²+10х+2х-3-6х²+9х= -12х²+24х-8