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f-8=2f+9f-8
We move all terms to the left:
f-8-(2f+9f-8)=0
We add all the numbers together, and all the variables
f-(11f-8)-8=0
We get rid of parentheses
f-11f+8-8=0
We add all the numbers together, and all the variables
-10f=0
f=0/-10
f=0
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