21-7=n;n=14

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Solution for 21-7=n;n=14 equation: 



21-7=nn=14

We move all terms to the left:

21-7-(nn)=0

We add all the numbers together, and all the variables

-nn+14=0

We move all terms containing n to the left, all other terms to the right

-nn=-14

n=-14/1

n=-14

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