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83=5f+38
We move all terms to the left:
83-(5f+38)=0
We get rid of parentheses
-5f-38+83=0
We add all the numbers together, and all the variables
-5f+45=0
We move all terms containing f to the left, all other terms to the right
-5f=-45
f=-45/-5
f=+9
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