Explanation:
1. 3ab +(-10ab)
-7ab
2.4a -4b
4 (a-b)
3.(-11m+7) -(20m-11)
-11m+7-20m+11
-31m+18
4.(2m-2n)-(15m+10n)
-13m-12n
5.-6xy- (-16xy)
-6xy+16xy
10xy
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