x(y+z)=2, y(x+z)=-28, z(x+y)=-10. Найдите x,y,z.

xy+zx =2yx+yz= -28zx+yz = -10xy = 2-zx2-xz + yz = -28  -> xz = 30 + yz30+yz + yz = -10  -> yz = -20 -> xz = 10 -> xy = -8yz/xz = -2 и xy = -8 -> y = -+4 , x = +-2  -> z = +-5