Combine like terms: add and subtract the coefficients of \(b\).<br><br>
&bull; \(b\) means \(1b\)<br>
&bull; \(2b - b + 9b = 2b - 1b + 9b\)<br>
&bull; \(2 - 1 + 9 = 10\), so the result is \(10b\)<br><br>
Final Answer: C: \(10b\)