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19=9+2f
We move all terms to the left:
19-(9+2f)=0
We add all the numbers together, and all the variables
-(2f+9)+19=0
We get rid of parentheses
-2f-9+19=0
We add all the numbers together, and all the variables
-2f+10=0
We move all terms containing f to the left, all other terms to the right
-2f=-10
f=-10/-2
f=+5
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