Answer:
This looks like a quadratic root problem on first glance, lets simplify it.
Distribute the 3.
-5 + 3b + 27b - 15 + 9b^2
Simplify like terms of b.
-5 + 30b - 15 + 9b^2
Simplify constants
30b - 20 + 9b^2
Rearrange it so its easier to tell
9b^2 + 30b - 20
Now solve for the roots,
which gets you x = .5694 & x= -3.902
