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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-22=0
We move all terms containing m to the left, all other terms to the right
4m=22
m=22/4
m=5+1/2
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