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3n+50=n+150
We move all terms to the left:
3n+50-(n+150)=0
We get rid of parentheses
3n-n-150+50=0
We add all the numbers together, and all the variables
2n-100=0
We move all terms containing n to the left, all other terms to the right
2n=100
n=100/2
n=50
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