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13f+23=7f+5
We move all terms to the left:
13f+23-(7f+5)=0
We get rid of parentheses
13f-7f-5+23=0
We add all the numbers together, and all the variables
6f+18=0
We move all terms containing f to the left, all other terms to the right
6f=-18
f=-18/6
f=-3
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