Respuesta :

-b+3
-11b-4
----------
-12b-1
Subtracting −b+3 from −11b−4, would mean:

-11b - 4 Minus (-b + 3)

-11b - 4 - (-b + 3)

-11b - 4 + b - 3

-11b + b - 4 - 3

-10b - 7

I hope this helped.