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-10+9f=6+f
We move all terms to the left:
-10+9f-(6+f)=0
We add all the numbers together, and all the variables
9f-(f+6)-10=0
We get rid of parentheses
9f-f-6-10=0
We add all the numbers together, and all the variables
8f-16=0
We move all terms containing f to the left, all other terms to the right
8f=16
f=16/8
f=2
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