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6f+19=2f-1
We move all terms to the left:
6f+19-(2f-1)=0
We get rid of parentheses
6f-2f+1+19=0
We add all the numbers together, and all the variables
4f+20=0
We move all terms containing f to the left, all other terms to the right
4f=-20
f=-20/4
f=-5
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