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(m+9)+5=13
We move all terms to the left:
(m+9)+5-(13)=0
We add all the numbers together, and all the variables
(m+9)-8=0
We get rid of parentheses
m+9-8=0
We add all the numbers together, and all the variables
m+1=0
We move all terms containing m to the left, all other terms to the right
m=-1
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