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-9f-9=7-7f
We move all terms to the left:
-9f-9-(7-7f)=0
We add all the numbers together, and all the variables
-9f-(-7f+7)-9=0
We get rid of parentheses
-9f+7f-7-9=0
We add all the numbers together, and all the variables
-2f-16=0
We move all terms containing f to the left, all other terms to the right
-2f=16
f=16/-2
f=-8
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