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5n+(3n+6)=31
We move all terms to the left:
5n+(3n+6)-(31)=0
We get rid of parentheses
5n+3n+6-31=0
We add all the numbers together, and all the variables
8n-25=0
We move all terms containing n to the left, all other terms to the right
8n=25
n=25/8
n=3+1/8
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