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4f+19+15f=19f+19
We move all terms to the left:
4f+19+15f-(19f+19)=0
We add all the numbers together, and all the variables
19f-(19f+19)+19=0
We get rid of parentheses
19f-19f-19+19=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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