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7(3m+2)=21m+14
We move all terms to the left:
7(3m+2)-(21m+14)=0
We multiply parentheses
21m-(21m+14)+14=0
We get rid of parentheses
21m-21m-14+14=0
We add all the numbers together, and all the variables
=0
m=0/1
m=0
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