40,158 : 23 - 0.073 x 13

First, let's solve the multiplication: 0.073 x 13 = 0.949

Now, let's substitute the result back into the equation: 40.158 : 23 - 0.949 = 1.75

So, 40.158 : 23 - 0.073 x 13 = 1.75.