4x-3y-6z=0 (1)2x-4y-14z=0 (2)(1)-(2)*24x-3y-6z-4x+8y+28z=05y+22z=0y=-22z/5y^2=19.36z^2(1)*4-(2)*316x-12y-24z-6x+12y+42z=010x+18z=0x=-9z/5=3.24z^2(2x^2+3y^2+z^2)/(x^2+5y^2+7z^2) =(6.48z^2+58.08z^2+z^2)...