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4n-2(5-3n)=12+8n-9
We move all terms to the left:
4n-2(5-3n)-(12+8n-9)=0
We add all the numbers together, and all the variables
4n-2(-3n+5)-(8n+3)=0
We multiply parentheses
4n+6n-(8n+3)-10=0
We get rid of parentheses
4n+6n-8n-3-10=0
We add all the numbers together, and all the variables
2n-13=0
We move all terms containing n to the left, all other terms to the right
2n=13
n=13/2
n=6+1/2
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