x-4y+2
6x2-2x+9
-0.1x2-0.4x
-45a2-2a
-2x2+3x+4
3a2+12a+18
83x-1
218x-218y
7x-1
10x2-9x+5
13a-5b-7c
-2x2-4xy+5y2
4x-6y
18a+115b-27
27x-56
8a-2b-10c
3x-14
-x+109
3x4+54
-11x72+41y72-3172
9x35+71y35
23x6-76
-16a4b3
s4t324
-192m5n5
-x4y442
24x4
-x7y8z948
20m17n11
3x5y4
2a
4ab
-2x2
9a2
12x
3c320b4
-649p3q2
-96m2n5
x2
-a23
6x2y2