The subtraction of equality.
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I couldn't answer the question because the question is not proper to slove. I just want you to follow the related link that explains how to solve the equation by completing the square.
If you mean: 4n-2n = 4 then 2n = 4 and n = 2
We slove problem on mixture by using the method called method of cross difference (cheaper / dearer) = (mean-cheaper)/(dearer-mean)
the problem is not proper to slove. I just want to suggest to follow the related link that explains the concept of completing the square clearly.