Respuesta :

Americ
= 2m - 9n - 6m + 3n - n
combine like terms (m with m terms and n with n terms)

= (2m - 6m) + (-9n + 3n - n)
add/subtract in parentheses

= -4m - 7n


ANSWER: -4m - 7n is the simplified expression

Hope this helps! :)