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(300+x)/3=1
We move all terms to the left:
(300+x)/3-(1)=0
We add all the numbers together, and all the variables
(x+300)/3-1=0
We multiply all the terms by the denominator
(x+300)-1*3=0
We add all the numbers together, and all the variables
(x+300)-3=0
We get rid of parentheses
x+300-3=0
We add all the numbers together, and all the variables
x+297=0
We move all terms containing x to the left, all other terms to the right
x=-297
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