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47=2f-4
We move all terms to the left:
47-(2f-4)=0
We get rid of parentheses
-2f+4+47=0
We add all the numbers together, and all the variables
-2f+51=0
We move all terms containing f to the left, all other terms to the right
-2f=-51
f=-51/-2
f=25+1/2
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