Respuesta :

In this case the answer is very simple.

Step 01:

- 10 (b - 3) = - 80

b = ?

Step 02:

- 10 (b - 3) = - 80

(b - 3) = -80 / -10

b - 3 = 8

b = 3 + 8

b = 11

The answer is:

b = 11