-12c+7
11c2-17
920y
118x2+34x
6x-4
7x-7
-16x2-16x+56
-1320a2+1715a
7x-1
11a+16b-4c
6a+5b+7
48a-36b
3x-2
12x-10
22x
-3x-42y+2
5x-253
12a+13b
3x4+54
-11x72+41y72-3172
9x35+71y35
23x6-76
14a2b2c4
4abc25
-56x5y7
a5b6c4
-18ab4c3
200x5
20m17n11
3x7y8
3x
-6x2
-9q2pr6
-4m3n
95m4
2ab23c
b32ac2
81x42y
x2
-y2z
-4b