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-48=6n+7n+9
We move all terms to the left:
-48-(6n+7n+9)=0
We add all the numbers together, and all the variables
-(13n+9)-48=0
We get rid of parentheses
-13n-9-48=0
We add all the numbers together, and all the variables
-13n-57=0
We move all terms containing n to the left, all other terms to the right
-13n=57
n=57/-13
n=-4+5/13
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