We start with the two expressions given in the problem: \[ \text{expr1} = 2ab + 9a - 4 \] \[ \text{expr2} = ab + 2 \]
Next, we distribute the negative sign to the second expression: \[ (2ab + 9a - 4) - (ab + 2) = 2ab + 9a - 4 - ab - 2 \]
Now, we combine the like terms: \[ (2ab - ab) + 9a + (-4 - 2) = ab + 9a - 6 \]
\(\boxed{ab + 9a - 6}\)
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