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3m-4(m+8)=-13
We move all terms to the left:
3m-4(m+8)-(-13)=0
We add all the numbers together, and all the variables
3m-4(m+8)+13=0
We multiply parentheses
3m-4m-32+13=0
We add all the numbers together, and all the variables
-1m-19=0
We move all terms containing m to the left, all other terms to the right
-m=19
m=19/-1
m=-19
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