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-9-2f+10=9-f
We move all terms to the left:
-9-2f+10-(9-f)=0
We add all the numbers together, and all the variables
-2f-(-1f+9)-9+10=0
We add all the numbers together, and all the variables
-2f-(-1f+9)+1=0
We get rid of parentheses
-2f+1f-9+1=0
We add all the numbers together, and all the variables
-1f-8=0
We move all terms containing f to the left, all other terms to the right
-f=8
f=8/-1
f=-8
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