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7f-19=4f+42
We move all terms to the left:
7f-19-(4f+42)=0
We get rid of parentheses
7f-4f-42-19=0
We add all the numbers together, and all the variables
3f-61=0
We move all terms containing f to the left, all other terms to the right
3f=61
f=61/3
f=20+1/3
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