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