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-8-5=9+3f-9
We move all terms to the left:
-8-5-(9+3f-9)=0
We add all the numbers together, and all the variables
-(+3f)-8-5=0
We add all the numbers together, and all the variables
-(+3f)-13=0
We get rid of parentheses
-3f-13=0
We move all terms containing f to the left, all other terms to the right
-3f=13
f=13/-3
f=-4+1/3
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