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23=5f-12
We move all terms to the left:
23-(5f-12)=0
We get rid of parentheses
-5f+12+23=0
We add all the numbers together, and all the variables
-5f+35=0
We move all terms containing f to the left, all other terms to the right
-5f=-35
f=-35/-5
f=+7
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