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(m+3)-2(m+6)=20
We move all terms to the left:
(m+3)-2(m+6)-(20)=0
We multiply parentheses
(m+3)-2m-12-20=0
We get rid of parentheses
m-2m+3-12-20=0
We add all the numbers together, and all the variables
-1m-29=0
We move all terms containing m to the left, all other terms to the right
-m=29
m=29/-1
m=-29
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