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