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15+2n=9+2n
We move all terms to the left:
15+2n-(9+2n)=0
We add all the numbers together, and all the variables
2n-(2n+9)+15=0
We get rid of parentheses
2n-2n-9+15=0
We add all the numbers together, and all the variables
6!=0
There is no solution for this equation
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