40x-7x+5ab

To simplify the expression \( 40x - 7x + 5ab \), first combine like terms:

1. Combine the terms involving \( x \): \[ 40x - 7x = 33x \]

Now, the expression can be rewritten as: \[ 33x + 5ab \]

So the simplified expression is: \[ 33x + 5ab \]