Row Reduction & Rank · Hard problem

Solve the system $\begin{cases} 0x_1 + 3x_2 + 0x_3 = 3 \\ -3x_1 - 2x_2 + 0x_3 = 4 \\ 0x_1 + 0x_2 + 3x_3 = 9 \end{cases}$ and give $x_1$, $x_2$, $x_3$.