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19=6f+1
We move all terms to the left:
19-(6f+1)=0
We get rid of parentheses
-6f-1+19=0
We add all the numbers together, and all the variables
-6f+18=0
We move all terms containing f to the left, all other terms to the right
-6f=-18
f=-18/-6
f=+3
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