assuming "and" means +, and the "n" indicates the base, we have
n+1 + 2n+1 = 2n^2+4
that has no integer solutions, so I guess you have somehow mangled the question.
It's not my job to figure out what you mean.
It's your job to say it so clearly you cannot be misunderstood.
solve for n in the equation 11n and 21n =204n
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