Respuesta :

dalendrk
9n - 7 = 5n + 5    |add 7 to both sides

9n = 5n + 12    |subtract 5n from both sides

4n = 12    |divide both sides by 4

n = 3
[tex]9n -7 = 5n + 5[/tex] 

[tex]9n=5n+5+7 [/tex] 

[tex]9n=5n+12[/tex] 

[tex]9n-5n=12[/tex] 

[tex]4n=12[/tex] 

[tex]n=12/4[/tex] 

[tex]n=3[/tex]