Consider this equation $(E)$ in $3$ variables $x,y,z$ :

$($E$),-7x+9y+8z=-504$

Problem: In Solutions $1,2$ enter distinct solutions of equation $(E)$; in Solution $3$ enter a solution in which all of the substitution values for $x,y,z$ are nonzero.

Solution $1[0,0,-63]$

Solution $2[72,0,0]$

Solution $3[$x$-$val, y$-$val, z$-$val$]$

Hint: If you found that $(1,2,3)$ is a solution, type your answer in the form: $1,2,3$

Your last answer was interpreted as follows: $[x-$val $,$ y$-$val $,$ z$-$val $]$

This answer is invalid. Forbidden variable or constant: val.

Your last answer was interpreted as follows: $-$val $,$ y$-$val $,$ z$-$val $]$

This answer is invalid. Forbidden variable or constant: val.

Your last answer was interpreted as follows: $-$val $,$ y$-$val $,$ z$-$val $]$

This answer is invalid. Forbidden variable or constant: val.