Respuesta :
First you Add 15+6. That equals 21. Afterwards you Subtract: 21-6 which equals = 15
[tex]15 + 6 = 21[/tex]
[tex]21 - 6 = 15[/tex]
And that is how you calculate it. Simple
[tex]15 + 6 = 21[/tex]
[tex]21 - 6 = 15[/tex]
And that is how you calculate it. Simple