3a-5a+8a 6n-2f+9n+7f
9a-6n-6a-14n+16a-10n 5xy-18xy+17xy+xy 4x2y+4b2c+12x2y-2b2c 4x-4x2+4x+13x2+6
4 5 7 5
—z-—y-—y+—z 11m2+5mn-5m2-2
5 6 5 6
7
—pq+5z-9pq 4mn-6a2b-14mn-3mn
8
5m-8n-9m-17n-12m+14n 7mn+15mn+13mn-mn 14x2y-2y2z+24x2y-5y2z 2z+9z2+4z+2z2+1
4 1 7 5
—x+—n+—n+—x 3t2-5mn+8t2-9
5 6 5 6
1
—ab+4n-9ab 4mn-12x2y+13mn+14mn
7
5m-3c-3m+6c+10m-13c 7ab-11ab+12ab+ab 14a2b+4b2c+5a2b-8b2c 8z+8z2+7z-17z2+4
1 1 7 5
—m+—n-—n+—m 11y2+7pq-3y2-2
2 8 2 8
1
—ab+6t-2ab 5ab-9x2y-17ab-5ab
3
8b+5b-8b 7y+6a-8y+8a
6m-7d-8m+4d+18m-12d 2xy-6xy+17xy-xy 11a2b-2b2c-22a2b-4b2c 7m-6m2-3m+14m2+9
4 9 7 5
—m+—t+—t-—m 3n2+7xy-8n2-4
3 8 3 8
4
—pq-6m+6pq 7mn+19x2y+19mn-22mn
3