15a
6x2-2x+9
-148a+445b
-124a2-12
6x-4
-3x2+9x
920ab-310a-b
-3a-14b
-2a-11b
11a+2b-8
2ab+15a-17b
12x+18y-30
x-7
-32a+2b-32
13
4a-11b+31
-47x-y
13x+107
7m3+83
31x6+176
4a21-821
18a5-5b
33x2y
20x3yz43
-56x5y7
a5b6c4
-72a3b4c5
2a5b2c3
20m17n11
3x7y8
3x
-6a2
-5x3y
-28a33b2
12x
12y3x3
-649p3q2
-96m2n5
-b26a2
-4x3
-4b