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2f+6=8f-9-9
We move all terms to the left:
2f+6-(8f-9-9)=0
We add all the numbers together, and all the variables
2f-(8f-18)+6=0
We get rid of parentheses
2f-8f+18+6=0
We add all the numbers together, and all the variables
-6f+24=0
We move all terms containing f to the left, all other terms to the right
-6f=-24
f=-24/-6
f=+4
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