Метод гаусса
2x+y-z=5
X-2y+3z=-3
7x+y-z=10

2x+y-z=52x=5-y+zx=5/2-y/2+z/2x=5-y+z/2x=5-y+z/2x-2y+3z=-3x=-3+2y-3zx=-3+2y-3z7x+y-z=107x=10-y+zx=10/7-y/7+z/7x=10-y+z/7