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-3=-9n+24
We move all terms to the left:
-3-(-9n+24)=0
We get rid of parentheses
9n-24-3=0
We add all the numbers together, and all the variables
9n-27=0
We move all terms containing n to the left, all other terms to the right
9n=27
n=27/9
n=3
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