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6m-21=2m-8m+56
We move all terms to the left:
6m-21-(2m-8m+56)=0
We add all the numbers together, and all the variables
6m-(-6m+56)-21=0
We get rid of parentheses
6m+6m-56-21=0
We add all the numbers together, and all the variables
12m-77=0
We move all terms containing m to the left, all other terms to the right
12m=77
m=77/12
m=6+5/12
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