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-30=6n+9n
We move all terms to the left:
-30-(6n+9n)=0
We add all the numbers together, and all the variables
-(+15n)-30=0
We get rid of parentheses
-15n-30=0
We move all terms containing n to the left, all other terms to the right
-15n=30
n=30/-15
n=-2
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