7a+15b-21
11c2-17
0.1x-1.2
-45a2-2a
x+4y-7
10x-7y
136x-114
79xy-2512x-12y
-6x+9y
-x2+12x-2
6a+5b+7
32x+40
x-7
-8x-9y
-33x-1
2a-26b-39c
132x-163
13x+107
-22a5-35
11x6-5y6
4a21-821
23x6-76
48a2bc
-6m3n4
72p4q3r5
3a4b2c32
24x4
-96x5y3
-189a9b3c5
-9m5n47
2a
2pq23r2
-9q2pr6
-28a33b2
12x
12y3x3
-125a
-72qp
x2
-c2ab
-7m2n25