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(1240+921+x)/3=1000
We move all terms to the left:
(1240+921+x)/3-(1000)=0
We add all the numbers together, and all the variables
(x+2161)/3-1000=0
We multiply all the terms by the denominator
(x+2161)-1000*3=0
We add all the numbers together, and all the variables
(x+2161)-3000=0
We get rid of parentheses
x+2161-3000=0
We add all the numbers together, and all the variables
x-839=0
We move all terms containing x to the left, all other terms to the right
x=839
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