The problem says:

Solve the equation, then choose the interval that contains the solution.

59-4a=-187

a. between 30 and 35

b. beween 60 and 65

c. between -105 and -110

d. between -10 and -15

Now, I work the problem out like they show in the example and I get 32, which is a, but the book says that it is b.

Im so confused, what am I doing wrong?