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600=90+3n
We move all terms to the left:
600-(90+3n)=0
We add all the numbers together, and all the variables
-(3n+90)+600=0
We get rid of parentheses
-3n-90+600=0
We add all the numbers together, and all the variables
-3n+510=0
We move all terms containing n to the left, all other terms to the right
-3n=-510
n=-510/-3
n=+170
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