7a+15b-21
9xy-30x-15y+1
-0.3x
-56x+23y+12
x+4y-7
3y2-20y
-178x-25y+1
-18x3+542x2+116x
-2a+14
10x2-9x+5
13a-5b-7c
35a-28b+112
-4a+28b+0.8
-16x+15
-33x-1
6x-25y
2a-3b
-239x-12
-22a5-35
-11x72+41y72-3172
-68a15+10615
x-2
-16a4b3
-6m3n4
96x2y2z2
-5a2b4c4
24x4
200x5
-189a9b3c5
-9m5n47
3x
4ab
-8p2q7r83
-4m3n
3x8y2
3c320b4
m24n
3200b
-7q2r29p
-5m4n28
-4b