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13=5-7m
We move all terms to the left:
13-(5-7m)=0
We add all the numbers together, and all the variables
-(-7m+5)+13=0
We get rid of parentheses
7m-5+13=0
We add all the numbers together, and all the variables
7m+8=0
We move all terms containing m to the left, all other terms to the right
7m=-8
m=-8/7
m=-1+1/7
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