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6f+6=2f+30
We move all terms to the left:
6f+6-(2f+30)=0
We get rid of parentheses
6f-2f-30+6=0
We add all the numbers together, and all the variables
4f-24=0
We move all terms containing f to the left, all other terms to the right
4f=24
f=24/4
f=6
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