Answer :

9 + 9n = 9

*subtract 9 from both sides

9n = 0

*divide both sides by 9

n = 0/9 = 0

n = 0
[tex]9+9n=9\\\\9+9n-9=9-9\\\\9n=0\\\\ 9n:9=0:9\\\\n=0[/tex]

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