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3f+9=6f+3
We move all terms to the left:
3f+9-(6f+3)=0
We get rid of parentheses
3f-6f-3+9=0
We add all the numbers together, and all the variables
-3f+6=0
We move all terms containing f to the left, all other terms to the right
-3f=-6
f=-6/-3
f=+2
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