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500+80+20+9=500+10n+9
We move all terms to the left:
500+80+20+9-(500+10n+9)=0
We add all the numbers together, and all the variables
-(10n+509)+500+80+20+9=0
We add all the numbers together, and all the variables
-(10n+509)+609=0
We get rid of parentheses
-10n-509+609=0
We add all the numbers together, and all the variables
-10n+100=0
We move all terms containing n to the left, all other terms to the right
-10n=-100
n=-100/-10
n=+10
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