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30=18-3n
We move all terms to the left:
30-(18-3n)=0
We add all the numbers together, and all the variables
-(-3n+18)+30=0
We get rid of parentheses
3n-18+30=0
We add all the numbers together, and all the variables
3n+12=0
We move all terms containing n to the left, all other terms to the right
3n=-12
n=-12/3
n=-4
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