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-19-f=-4f+8
We move all terms to the left:
-19-f-(-4f+8)=0
We add all the numbers together, and all the variables
-1f-(-4f+8)-19=0
We get rid of parentheses
-1f+4f-8-19=0
We add all the numbers together, and all the variables
3f-27=0
We move all terms containing f to the left, all other terms to the right
3f=27
f=27/3
f=9
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