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18+5n=25-9n
We move all terms to the left:
18+5n-(25-9n)=0
We add all the numbers together, and all the variables
5n-(-9n+25)+18=0
We get rid of parentheses
5n+9n-25+18=0
We add all the numbers together, and all the variables
14n-7=0
We move all terms containing n to the left, all other terms to the right
14n=7
n=7/14
n=1/2
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