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6+8m-3=6m+21-4m
We move all terms to the left:
6+8m-3-(6m+21-4m)=0
We add all the numbers together, and all the variables
8m-(2m+21)+6-3=0
We add all the numbers together, and all the variables
8m-(2m+21)+3=0
We get rid of parentheses
8m-2m-21+3=0
We add all the numbers together, and all the variables
6m-18=0
We move all terms containing m to the left, all other terms to the right
6m=18
m=18/6
m=3
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