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-3(-10n-18)=324
We move all terms to the left:
-3(-10n-18)-(324)=0
We multiply parentheses
30n+54-324=0
We add all the numbers together, and all the variables
30n-270=0
We move all terms containing n to the left, all other terms to the right
30n=270
n=270/30
n=9
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