[Python] Remake color mixing function to find color to mix with given color to get the given...

My question looks very strange, but I'll try my best to explain it. I got this function

def combine_hex_values(d):
d_items = sorted(d)
tot_weight = 2
red = int(sum([int(k[:2], 16) for k in d_items])/tot_weight)
green = int(sum([int(k[2:4], 16) for k in d_items])/tot_weight)
blue = int(sum([int(k[4:6], 16) for k in d_items])/tot_weight)
zpad = lambda x: x if len(x)==2 else '0' + x
return zpad(hex(red)[2:]) + zpad(hex(green)[2:]) + zpad(hex(blue)[2:])


you paste 2 colors like this:

print(combine_hex_values({"FF79FF ", "4c34eb"}))


and you get resulting color a556f5. So basically it works like this: color1+color2 = result. What I want is to find color2 when color1 and result are known. So, imagine we know the result color is white and color1 is blue. How to make a function which would calcuate color2 to mix with color1 to get result color? (the color we mix with color1) ?

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