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2(n-7)=31
We move all terms to the left:
2(n-7)-(31)=0
We multiply parentheses
2n-14-31=0
We add all the numbers together, and all the variables
2n-45=0
We move all terms containing n to the left, all other terms to the right
2n=45
n=45/2
n=22+1/2
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