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4f+3=19+8f
We move all terms to the left:
4f+3-(19+8f)=0
We add all the numbers together, and all the variables
4f-(8f+19)+3=0
We get rid of parentheses
4f-8f-19+3=0
We add all the numbers together, and all the variables
-4f-16=0
We move all terms containing f to the left, all other terms to the right
-4f=16
f=16/-4
f=-4
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