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-7f-7=-5f+9
We move all terms to the left:
-7f-7-(-5f+9)=0
We get rid of parentheses
-7f+5f-9-7=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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