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