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488+n+(n+6)=720
We move all terms to the left:
488+n+(n+6)-(720)=0
We add all the numbers together, and all the variables
n+(n+6)-232=0
We get rid of parentheses
n+n+6-232=0
We add all the numbers together, and all the variables
2n-226=0
We move all terms containing n to the left, all other terms to the right
2n=226
n=226/2
n=113
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