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-6=f+-9
We move all terms to the left:
-6-(f+-9)=0
We add all the numbers together, and all the variables
-(f-9)-6=0
We get rid of parentheses
-f+9-6=0
We add all the numbers together, and all the variables
-1f+3=0
We move all terms containing f to the left, all other terms to the right
-f=-3
f=-3/-1
f=+3
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