7x-6y
-5x2+2x-7
0.8a2+1.5a-b
13a2-a
6x-2y+9
-15x3+6x2+11x
-2x+2
-7144ab+221a+3b
-6x+9y
11a+16b-4c
2ab+15a-17b
12x+18y-30
x-7
58x2-52y2
-19x-4
-4a-81b
-2a-6310b
-6716a+49b
7m3+83
31x6+176
11x6-136
23x6-76
-35x4y5
15a2b2c
-56x5y7
-5a2b4c4
12x3y3
-x7y8z948
-p5q4r425
3a9b8c420
2m23n3
-6a2
-8p2q7r83
-4m3n
9z2x2
4y3x2z
b32ac2
-96m2n5
10x
-5m4n28
-4p3r3