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-8+4f-3=9+9f
We move all terms to the left:
-8+4f-3-(9+9f)=0
We add all the numbers together, and all the variables
4f-(9f+9)-8-3=0
We add all the numbers together, and all the variables
4f-(9f+9)-11=0
We get rid of parentheses
4f-9f-9-11=0
We add all the numbers together, and all the variables
-5f-20=0
We move all terms containing f to the left, all other terms to the right
-5f=20
f=20/-5
f=-4
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