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f+10f-1=10f-9
We move all terms to the left:
f+10f-1-(10f-9)=0
We add all the numbers together, and all the variables
11f-(10f-9)-1=0
We get rid of parentheses
11f-10f+9-1=0
We add all the numbers together, and all the variables
f+8=0
We move all terms containing f to the left, all other terms to the right
f=-8
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