Answer:
-8m+10n
Explanation:
first do the parenesis 3 x 2n = 6n 3 x 7m= 21m
then do 4 x n =4n 4x 2m=8m
5m+6n-21m+4n+8m
5m+3(2n-7m)+4(n+2m)
Simplify the parenthesis.
Reorder so each like term are by each other.
5m+8m-21m+6n+4n
Combine those like terms.
13m-21m+10n
-hope it helps
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