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(m-8)+(m-8)=15
We move all terms to the left:
(m-8)+(m-8)-(15)=0
We get rid of parentheses
m+m-8-8-15=0
We add all the numbers together, and all the variables
2m-31=0
We move all terms containing m to the left, all other terms to the right
2m=31
m=31/2
m=15+1/2
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