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-54=-9+-23n
We move all terms to the left:
-54-(-9+-23n)=0
We add all the numbers together, and all the variables
-(-23n)-54=0
We get rid of parentheses
23n-54=0
We move all terms containing n to the left, all other terms to the right
23n=54
n=54/23
n=2+8/23
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