2a-b
9a2-4b2+5
-1.3a
310x+12
-2x-1
10x-7y
16x+215
29x2+32x
-2a+14
-5x+9y+4
5a+5b-c
12x+18y-30
5x2-9x
-10a-27b+60
-54x-8
-59a+5b+30c
83x-152
x+23y
3a4+12
11x6-5y6
4a21-821
18a5-5b
14a2b2c4
15a2b2c
72x3
a5b6c4
-250x4y2
-x7y8z948
20m17n11
-9m5n47
3x
-2y2z3x
-2x2
-8y23x2
-43a3
4y3x2z
3x47
3200b
-7q2r29p
-5p3q22
3a4bc