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