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5n2m+15nm2+ 30nm + 50 n3m

8a2n-24 an+32an2

20mn- 60mn+ 30mn+ 70mn

2a2b+4ab2+10a3b3

4ab3+10a2b2

10mn(2-6+3+7)

2a2b(2a+5b)

2ab(a+2b+5a2b2)

8an(a-3+4n2)

5nm(n+3+6+10 n2)