Test suite has been updated to not give away the solution.
The solution (or actually one of many solutions) of this cubic equation with minimal integer positive value of (x+y+z), is x = 30,864,197 , y = -246,913,580 , z = 216,049,384 ; in that case, x+y+z = 1, and you can't get smaller than that. (Sorry, I wrote the same thing as a remark in the solution script, but I made a typo and wrote the wrong value of z there.)
subtract central cross
What number has this problem?
Find the 9's Complement
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Adding and Subtracting UINT variables
Slitherlink IV: Recursive (medium size)
GJam March 2016 IOW: Passwords and the Block Set
Create array of all Distances between two Sets of Points
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