7a+15b-21
11c2-17
-4.2a2+4.8a+1.1
54x2+2
-10x-2y+2
-xy-11x+9y
-16x2-16x+56
79xy-2512x-12y
-2a+14
-5x+9y+4
6a+5b+7
9y+8
5x2-9x
18a+115b-27
-5x+3
2x-23y+59
2a-3b
x+23y
x2+11y2
-6x35-3835
11a20+47b20
2x3-2y3
84x3y4z6
3x2y
72x3
-5a2b4c4
24x4
-x7y8z948
-p5q4r425
3a9b8c420
3x
2pq23r2
-9q2pr6
-28a33b2
9z2x2
3c320b4
-24y2x
3200b
-q2r23
-5m4n28
-7m2n25