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-9-7f=3f+9-9f
We move all terms to the left:
-9-7f-(3f+9-9f)=0
We add all the numbers together, and all the variables
-7f-(-6f+9)-9=0
We get rid of parentheses
-7f+6f-9-9=0
We add all the numbers together, and all the variables
-1f-18=0
We move all terms containing f to the left, all other terms to the right
-f=18
f=18/-1
f=-18
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