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-3(m+13)+11=20
We move all terms to the left:
-3(m+13)+11-(20)=0
We add all the numbers together, and all the variables
-3(m+13)-9=0
We multiply parentheses
-3m-39-9=0
We add all the numbers together, and all the variables
-3m-48=0
We move all terms containing m to the left, all other terms to the right
-3m=48
m=48/-3
m=-16
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