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-9=m/4-13
We move all terms to the left:
-9-(m/4-13)=0
We get rid of parentheses
-m/4+13-9=0
We multiply all the terms by the denominator
-m+13*4-9*4=0
We add all the numbers together, and all the variables
-1m+16=0
We move all terms containing m to the left, all other terms to the right
-m=-16
m=-16/-1
m=+16
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