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5+9n=7+9n
We move all terms to the left:
5+9n-(7+9n)=0
We add all the numbers together, and all the variables
9n-(9n+7)+5=0
We get rid of parentheses
9n-9n-7+5=0
We add all the numbers together, and all the variables
-2!=0
There is no solution for this equation
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