15a
-5x2+2x-7
-1.3a
118x2+34x
-2x2+3x+4
7x-7
-178x-25y+1
218x-218y
-2a+14
-5x+9y+4
2ab+15a-17b
30x2-35x
5x2-9x
2x-3
33x-16
3a+24
6a-2b
-376a-56
x2+11y2
-6x35-3835
-68a15+10615
x-2
-35x4y5
3x2y
-56x5y7
-m6n72
24x4
-96x5y3
-189a9b3c5
-9m5n47
2m23n3
2pq23r2
9ab
9a2
3x8y2
6ab
-125a
81x42y
-q2r23
-5m4n28
2xy2z