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(n+1)+(n+3)-7+2=5
We move all terms to the left:
(n+1)+(n+3)-7+2-(5)=0
We add all the numbers together, and all the variables
(n+1)+(n+3)-10=0
We get rid of parentheses
n+n+1+3-10=0
We add all the numbers together, and all the variables
2n-6=0
We move all terms containing n to the left, all other terms to the right
2n=6
n=6/2
n=3
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