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9=6n+9+30n
We move all terms to the left:
9-(6n+9+30n)=0
We add all the numbers together, and all the variables
-(36n+9)+9=0
We get rid of parentheses
-36n-9+9=0
We add all the numbers together, and all the variables
-36n=0
n=0/-36
n=0
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