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3f-6=4+2f
We move all terms to the left:
3f-6-(4+2f)=0
We add all the numbers together, and all the variables
3f-(2f+4)-6=0
We get rid of parentheses
3f-2f-4-6=0
We add all the numbers together, and all the variables
f-10=0
We move all terms containing f to the left, all other terms to the right
f=10
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