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(2.580+2920+x)/3=3000
We move all terms to the left:
(2.580+2920+x)/3-(3000)=0
We add all the numbers together, and all the variables
(x+2922.58)/3-3000=0
We multiply all the terms by the denominator
(x+2922.58)-3000*3=0
We add all the numbers together, and all the variables
(x+2922.58)-9000=0
We get rid of parentheses
x+2922.58-9000=0
We add all the numbers together, and all the variables
x-6077.42=0
We move all terms containing x to the left, all other terms to the right
x=6077.42
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