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23=11+3f
We move all terms to the left:
23-(11+3f)=0
We add all the numbers together, and all the variables
-(3f+11)+23=0
We get rid of parentheses
-3f-11+23=0
We add all the numbers together, and all the variables
-3f+12=0
We move all terms containing f to the left, all other terms to the right
-3f=-12
f=-12/-3
f=+4
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