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19=3f+4
We move all terms to the left:
19-(3f+4)=0
We get rid of parentheses
-3f-4+19=0
We add all the numbers together, and all the variables
-3f+15=0
We move all terms containing f to the left, all other terms to the right
-3f=-15
f=-15/-3
f=+5
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