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