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