Anyway to roll negative dice?

I'm going to start a campaign with my friends using the new "Of Dreams and Magic" system.  It uses two 10 sided dice, however one is considered "Over", and one "Under. So one dice, and positive, and another is negative.  If your "Over" is a 5, and your "Under" is a 4, you would have +1. So my question is, is there a way to either A, automatically have it roll a negative D10, or is there a way to roll 2 different colored 10's so we can do the math ourselves?

So [[ 1d10 - 1d10 ]] doesn't do what you want?

So it does, but I don't understand how it does that?  Guess I'll have to read into it more.

It rolls the dice before it resolves math functions. So it finds the results of the two rolls then calculates the difference

its an inline roll (the brackets tell it to do an inline roll) so it rolls any dice in that level of the roll (you can nest to 99 levels deep) and resolves levels from deepest to shallowest (or inside to outside) and then performs any math functions that exist in that level. It's the same thing as doing 1d20+5, but you have a variable modifier instead of a constant. The order of operations wiki may be helpful for you understanding the nesting. <a href="https://wiki.roll20.net/Dice_Reference#Order_of_Operations" rel="nofollow">https://wiki.roll20.net/Dice_Reference#Order_of_Operations</a> And the Dice Reference wiki in general:&nbsp;<a href="https://wiki.roll20.net/Dice_Reference" rel="nofollow">https://wiki.roll20.net/Dice_Reference</a>