9-n,n=4

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Solution for 9-n,n=4 equation: 



9-n.n=4

We move all terms to the left:

9-n.n-(4)=0

We add all the numbers together, and all the variables

-n.n+5=0

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

-n.n=-5

n=-5/1

n=-5

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