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200=50+2n
We move all terms to the left:
200-(50+2n)=0
We add all the numbers together, and all the variables
-(2n+50)+200=0
We get rid of parentheses
-2n-50+200=0
We add all the numbers together, and all the variables
-2n+150=0
We move all terms containing n to the left, all other terms to the right
-2n=-150
n=-150/-2
n=+75
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