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