x-4y+2
-a2+a
920y
-3712c2+16c
5x2+4x+3
-xy-11x+9y
2x+12y+9
-3a-14b
7x-1
-x2+12x-2
6a+5b+7
48a-36b
-0.9a2-4.5a+3.6b
-16x+15
31x-2
a+6
2a-3b
9a-16b
7m3+83
31x6+176
11x6-136
2x3-2y3
84x3y4z6
-6m3n4
-168a5b3
a5b6c4
-72a3b4c5
-96x5y3
-189a9b3c5
a9b11c784
2m23n3
2pq23r2
-8p2q7r83
-3x16
-43a3
4y3x2z
-24y2x
225c4a4b6
12xy
-4x3
3a4bc