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-18+3n=+30-9n
We move all terms to the left:
-18+3n-(+30-9n)=0
We add all the numbers together, and all the variables
3n-(-9n+30)-18=0
We get rid of parentheses
3n+9n-30-18=0
We add all the numbers together, and all the variables
12n-48=0
We move all terms containing n to the left, all other terms to the right
12n=48
n=48/12
n=4
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