That is the same as [tex](-11b-4)-(-b+3)[/tex}. Negatives are gross, so let's distribute it. Remember, that negative can be turned into a positive by changing the sign on every term in the parentheses. It's called distributing the negative. So we can change it to [tex](-11b-4)+(b-3)[/tex]. Now it's just basic addition.
[tex]-11b-4+b-3 = -10b-7[/tex]
So your final answer is:
[tex]-10b-7[/tex]
