x-4y+2
-5x2+2x-7
76x
12a2+524a-13
6x-2y+9
3y2-20y
16x+215
218x-218y
7x-1
-5x+9y+4
2ab+15a-17b
32x+40
5x2-9x
12x-10
10a-b
-4a-81b
-112x+512y
9a-16b
11x3-13
a6-b6
11a20+47b20
2x3-2y3
-16a4b3
15a2b2c
72p4q3r5
2x5y4z3
24x4
-96x5y3
36x3y6
-25x10y63
2a
-6a2
9ab
-28a33b2
12x
6ab
-649p3q2
81x42y
12xy
-c2ab
-4b