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715=448+3n
We move all terms to the left:
715-(448+3n)=0
We add all the numbers together, and all the variables
-(3n+448)+715=0
We get rid of parentheses
-3n-448+715=0
We add all the numbers together, and all the variables
-3n+267=0
We move all terms containing n to the left, all other terms to the right
-3n=-267
n=-267/-3
n=+89
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