7a+15b-21
-c2-6c
1.5a-0.9
54x2+2
-10x-2y+2
2ab-2a+12b
-178x-25y+1
1120x2-176xy-112
7x-1
3a-3c
13ab+2a+5b
5ab-12a+2b
-4a+28b+0.8
-8x-9y
33x+8
-3x-42y+2
-12a-125b+72
2a+5b
x2+11y2
41a24+524
11a20+47b20
23x6-76
33x2y
s4t324
72p4q3r5
3a4b2c32
-18ab4c3
-96x5y3
-189a9b3c5
3x5y4
-4y3x
-3x22
-9q2pr6
-3x16
3x8y2
8n4m
m24n
225c4a4b6
2m2
-xy2
-4b