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500=120+2n
We move all terms to the left:
500-(120+2n)=0
We add all the numbers together, and all the variables
-(2n+120)+500=0
We get rid of parentheses
-2n-120+500=0
We add all the numbers together, and all the variables
-2n+380=0
We move all terms containing n to the left, all other terms to the right
-2n=-380
n=-380/-2
n=+190
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