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23=5f-2
We move all terms to the left:
23-(5f-2)=0
We get rid of parentheses
-5f+2+23=0
We add all the numbers together, and all the variables
-5f+25=0
We move all terms containing f to the left, all other terms to the right
-5f=-25
f=-25/-5
f=+5
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