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f=2(7)-3f
We move all terms to the left:
f-(2(7)-3f)=0
We add all the numbers together, and all the variables
f-(-3f+27)=0
We get rid of parentheses
f+3f-27=0
We add all the numbers together, and all the variables
4f-27=0
We move all terms containing f to the left, all other terms to the right
4f=27
f=27/4
f=6+3/4
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