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n+(n-30)=59
We move all terms to the left:
n+(n-30)-(59)=0
We get rid of parentheses
n+n-30-59=0
We add all the numbers together, and all the variables
2n-89=0
We move all terms containing n to the left, all other terms to the right
2n=89
n=89/2
n=44+1/2
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