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19f+18=15f-5
We move all terms to the left:
19f+18-(15f-5)=0
We get rid of parentheses
19f-15f+5+18=0
We add all the numbers together, and all the variables
4f+23=0
We move all terms containing f to the left, all other terms to the right
4f=-23
f=-23/4
f=-5+3/4
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