Without Solving the Following System of Equations, Tell What the Solution

Essay

Without solving the following system of equations, tell what the solution is. Explain your answer.
$$\begin{aligned}5 x-4 y+6 z & =-3 \\-30 x+24 y-36 z & =18 \\20 x-16 y+24 z & =-12\end{aligned}$$