10 x -5 -4 x 3 ?

The expression is 10x - 5 - 4x * 3.

First, we need to solve the multiplication, which is -4x * 3 = -12x.

Then, we can substitute the value of -12x into the expression:

10x - 5 - 12x

Next, we can combine like terms:

-2x - 5

So the final answer is -2x - 5.