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-7-9-4f=-9f+9
We move all terms to the left:
-7-9-4f-(-9f+9)=0
We add all the numbers together, and all the variables
-4f-(-9f+9)-16=0
We get rid of parentheses
-4f+9f-9-16=0
We add all the numbers together, and all the variables
5f-25=0
We move all terms containing f to the left, all other terms to the right
5f=25
f=25/5
f=5
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