13a+2b-2a-b

To simplify the expression \(13a + 2b - 2a - b\), you can combine like terms:

1. Combine the \(a\) terms: \(13a - 2a = 11a\)
2. Combine the \(b\) terms: \(2b - b = 1b\)

Putting it all together:

\[ 11a + b \]

So, the simplified expression is \(11a + b\).