15a
9xy-30x-15y+1
-3.5a2+0.8a
13a2-a
-10x-2y+2
7x-7
-16x2-16x+56
218x-218y
7x-1
11a+16b-4c
6a+5b+7
30x2-35x
3x-2
12x-10
-2x-11
31a-b+53c
132x-163
4x-4y
3a4+12
-11x72+41y72-3172
9x35+71y35
x-2
33x2y
20x3yz43
-192m5n5
a5b6c4
-18ab4c3
-96x5y3
32x6y7
3x5y4
2m23n3
4ab
8a3b2
-3x16
12x
12y3x3
m24n
81x42y
-94x
xy4
2xy2z