Hi how u doin ?
[tex](x - 6) + 8 = 13[/tex]
Subtract both sides 8
[tex](x - 6) + 8 - 8 = 13 - 8[/tex]
[tex]x - 6 = 5[/tex]
Add both sides 6
[tex]x - 6 + 6 = 5 + 6[/tex]
[tex]x = 11[/tex]
There u go...
Have a great day ❤