If x, y and z are integers, 3x
is satisfied for x=y=z=2.
Are there any other solutions?
(In reply to Not other small ones
The Excel problem: at E5, say, write E$1+$A5. If you copy this formula,
the 1 in the first term and the A in the second one won't be changed.
But I wonder if there won't be precision problems...