n+9=n+(12-7)

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Solution for n+9=n+(12-7) equation: 



n+9=n+(12-7)

We move all terms to the left:

n+9-(n+(12-7))=0

We add all the numbers together, and all the variables

n-(n+5)+9=0

We get rid of parentheses

n-n-5+9=0

We add all the numbers together, and all the variables

4!=0

There is no solution for this equation

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