-2x+3y-2
-a2+a
0.7x2-0.4x+y
-56x+23y+12
5x2+4x+3
10x-7y
-2x+2
10x2+78x+13
7x-1
11a+2b-8
5a+5b-c
32x+40
25x2-252x+10
12x-10
33x+8
6x-25y
5x-253
4x-4y
3x4+54
-11x72+41y72-3172
11x6-136
2x3-2y3
14a2b2c4
3x2y
72p4q3r5
-5a2b4c4
24x4
2a5b2c3
32x6y7
3a9b8c420
-4y3x
-6x2
-5x3y
-28a33b2
9z2x2
3c320b4
b32ac2
81x42y
-13b
-a23
2xy2z