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```
(3*($x+$y+$z) % 9) == 5
```

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if (4*($x+$y+$z) % 9) == 5  then ($x+$y+$z) % 9 = 8
if (5*($x+$y+$z) % 9) == 5  then  ($x+$y+$z) % 9 = 1
if (7*($x+$y+$z) % 9) == 5  then  ($x+$y+$z) % 9 = 2