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(300+x)/5=80
We move all terms to the left:
(300+x)/5-(80)=0
We add all the numbers together, and all the variables
(x+300)/5-80=0
We multiply all the terms by the denominator
(x+300)-80*5=0
We add all the numbers together, and all the variables
(x+300)-400=0
We get rid of parentheses
x+300-400=0
We add all the numbers together, and all the variables
x-100=0
We move all terms containing x to the left, all other terms to the right
x=100
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