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19f-45=23f-6
We move all terms to the left:
19f-45-(23f-6)=0
We get rid of parentheses
19f-23f+6-45=0
We add all the numbers together, and all the variables
-4f-39=0
We move all terms containing f to the left, all other terms to the right
-4f=39
f=39/-4
f=-9+3/4
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