5. (1 point) Find the set of solutions for the linear system $$ \begin{array}{r) x_{1)-3 x_{2}-4 x_{3}=5 -X_{2}+3 x_(3)=7 W -4 x_{3}=4 \end{array} $$ Use $\mathbf {s 1}, \mathbf{s 2}$, etc. for the free variables if necessary. $ $$ \left(x_{1), x_{2), x_{3} ight)=(\longrightarrow,-) $$ SP.SD.430