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38=39-f
We move all terms to the left:
38-(39-f)=0
We add all the numbers together, and all the variables
-(-1f+39)+38=0
We get rid of parentheses
1f-39+38=0
We add all the numbers together, and all the variables
f-1=0
We move all terms containing f to the left, all other terms to the right
f=1
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