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-2m+4(2m-1)=9m+23
We move all terms to the left:
-2m+4(2m-1)-(9m+23)=0
We multiply parentheses
-2m+8m-(9m+23)-4=0
We get rid of parentheses
-2m+8m-9m-23-4=0
We add all the numbers together, and all the variables
-3m-27=0
We move all terms containing m to the left, all other terms to the right
-3m=27
m=27/-3
m=-9
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