Помогите пожалуйста срочно

Решите задачу:

$\left \{ \begin{array}{c}3x-4y+2z=5,\\x-3y+z=-4,\\-3x+2y-z=6;\end{array}\right. \ \left \{ \begin{array}{c}3x-4y+2z=5,\\x-3y+z=-4,\\-2x-y=2;\end{array}\right. \ \left \{ \begin{array}{c}3x-4y+2z=5,\\x-3y+z=-4,\\y=-2x-2;\end{array}\right. \\ \left \{ \begin{array}{c}11x-2z=-3,\\7x+z=-10,\\y=-2x-2;\end{array}\right. \ \left \{ \begin{array}{c}11x-2z=-3,\\z=-7x-10,\\y=-2x-2;\end{array}\right. \ \left \{ \begin{array}{c}-3x=17,\\y=-2x-2\\z=-7x-10;\end{array}\right.$
$\left \{ \begin{array}{c}x=-\frac{17}{3},\\y=\frac{28}{3}\\z=\frac{89}{3};\end{array}\right.$