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2ab+7a-10b
2ab-2a+12b
16x+16
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11a+16b-4c
5a+5b-c
5ab-12a+2b
-0.9a2-4.5a+3.6b
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3x-14
9a-16b
3x4+54
-11x72+41y72-3172
11a20+47b20
11a12-b12
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72p4q3r5
a5b6c4
-72a3b4c5
-27m7n4
20m17n11
3x5y4
3x
-3x22
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-8y23x2
95m4
12y3x3
3x47
-96m2n5
x2
-4x3
2xy2z