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-13-7m=-6m+-9
We move all terms to the left:
-13-7m-(-6m+-9)=0
We add all the numbers together, and all the variables
-7m-(-6m-9)-13=0
We get rid of parentheses
-7m+6m+9-13=0
We add all the numbers together, and all the variables
-1m-4=0
We move all terms containing m to the left, all other terms to the right
-m=4
m=4/-1
m=-4
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