Combat Dice Equation

I'm pretty sure this has been asked many times before, but exactly what is the little equation in which the Attack Damage(ex.8-11) of a unit is created?

(Base Damage + Number of Dice) - (Base Damage + (Number of Dice x Number of Sides))

Thanks

The above formula is wrong,

It is:

base damage + (number of die x random number up to the number of sides on the die)

It might have different random numbers for each die, dunno, but the 8-11 is just the min damage to max damage.

It's not wrong.

The random number is just something obvious that I left out of the equation.

Base damage 16.
Number of Dice 4.
Number of Sides 5.

16 + 4 = 20
16 + (4 x 5) = 36

20 - 36 damage.