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1=9+4f
We move all terms to the left:
1-(9+4f)=0
We add all the numbers together, and all the variables
-(4f+9)+1=0
We get rid of parentheses
-4f-9+1=0
We add all the numbers together, and all the variables
-4f-8=0
We move all terms containing f to the left, all other terms to the right
-4f=8
f=8/-4
f=-2
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