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-36-3n=9+7n
We move all terms to the left:
-36-3n-(9+7n)=0
We add all the numbers together, and all the variables
-3n-(7n+9)-36=0
We get rid of parentheses
-3n-7n-9-36=0
We add all the numbers together, and all the variables
-10n-45=0
We move all terms containing n to the left, all other terms to the right
-10n=45
n=45/-10
n=-4+1/2
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