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52=8m+13m
We move all terms to the left:
52-(8m+13m)=0
We add all the numbers together, and all the variables
-(+21m)+52=0
We get rid of parentheses
-21m+52=0
We move all terms containing m to the left, all other terms to the right
-21m=-52
m=-52/-21
m=2+10/21
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