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12f+23=16f-5
We move all terms to the left:
12f+23-(16f-5)=0
We get rid of parentheses
12f-16f+5+23=0
We add all the numbers together, and all the variables
-4f+28=0
We move all terms containing f to the left, all other terms to the right
-4f=-28
f=-28/-4
f=+7
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