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13=4m+1
We move all terms to the left:
13-(4m+1)=0
We get rid of parentheses
-4m-1+13=0
We add all the numbers together, and all the variables
-4m+12=0
We move all terms containing m to the left, all other terms to the right
-4m=-12
m=-12/-4
m=+3
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