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12f-20=8f+13+19
We move all terms to the left:
12f-20-(8f+13+19)=0
We add all the numbers together, and all the variables
12f-(8f+32)-20=0
We get rid of parentheses
12f-8f-32-20=0
We add all the numbers together, and all the variables
4f-52=0
We move all terms containing f to the left, all other terms to the right
4f=52
f=52/4
f=13
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