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-9-13f=15-9f
We move all terms to the left:
-9-13f-(15-9f)=0
We add all the numbers together, and all the variables
-13f-(-9f+15)-9=0
We get rid of parentheses
-13f+9f-15-9=0
We add all the numbers together, and all the variables
-4f-24=0
We move all terms containing f to the left, all other terms to the right
-4f=24
f=24/-4
f=-6
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