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(x+400)/120=120
We move all terms to the left:
(x+400)/120-(120)=0
We multiply all the terms by the denominator
(x+400)-120*120=0
We add all the numbers together, and all the variables
(x+400)-14400=0
We get rid of parentheses
x+400-14400=0
We add all the numbers together, and all the variables
x-14000=0
We move all terms containing x to the left, all other terms to the right
x=14000
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