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