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38=-3f+15
We move all terms to the left:
38-(-3f+15)=0
We get rid of parentheses
3f-15+38=0
We add all the numbers together, and all the variables
3f+23=0
We move all terms containing f to the left, all other terms to the right
3f=-23
f=-23/3
f=-7+2/3
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