system of linear equations in three variables: ax + by + cz = d

for example:

2X + 3Y + 4Z = 119

5X - 6Y + 7Z = 80

8X + 9Y + 10Z = 353

you just need to enter

equation 1) 2 3 4 119

equation 2) 5 -6 7 80

equation 3) 8 9 10 353

result: x=12 y=13 z=14