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