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-3-3n=n-7-3n
We move all terms to the left:
-3-3n-(n-7-3n)=0
We add all the numbers together, and all the variables
-3n-(-2n-7)-3=0
We get rid of parentheses
-3n+2n+7-3=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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