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-13=4m-9
We move all terms to the left:
-13-(4m-9)=0
We get rid of parentheses
-4m+9-13=0
We add all the numbers together, and all the variables
-4m-4=0
We move all terms containing m to the left, all other terms to the right
-4m=4
m=4/-4
m=-1
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