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19=3f+10
We move all terms to the left:
19-(3f+10)=0
We get rid of parentheses
-3f-10+19=0
We add all the numbers together, and all the variables
-3f+9=0
We move all terms containing f to the left, all other terms to the right
-3f=-9
f=-9/-3
f=+3
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