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11+m(13-3m)-13m=11+13m-3m^2-13
We move all terms to the left:
11+m(13-3m)-13m-(11+13m-3m^2-13)=0
We add all the numbers together, and all the variables
-(11+13m-3m^2-13)+m(-3m+13)-13m+11=0
We add all the numbers together, and all the variables
-(11+13m-3m^2-13)-13m+m(-3m+13)+11=0
We multiply parentheses
-(11+13m-3m^2-13)-3m^2-13m+13m+11=0
We get rid of parentheses
3m^2-3m^2-13m-13m+13m-11+13+11=0
We add all the numbers together, and all the variables
-13m+13=0
We move all terms containing m to the left, all other terms to the right
-13m=-13
m=-13/-13
m=1
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