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700+80+n=700+80+n=
We move all terms to the left:
700+80+n-(700+80+n)=0
We add all the numbers together, and all the variables
n-(n+780)+700+80=0
We add all the numbers together, and all the variables
n-(n+780)+780=0
We get rid of parentheses
n-n-780+780=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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