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3f=15+f
We move all terms to the left:
3f-(15+f)=0
We add all the numbers together, and all the variables
3f-(f+15)=0
We get rid of parentheses
3f-f-15=0
We add all the numbers together, and all the variables
2f-15=0
We move all terms containing f to the left, all other terms to the right
2f=15
f=15/2
f=7+1/2
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