example graphs: 5x2+7y2+9z2 (w=5x²+7y²+9z²) 1x+2y2-9z2 (w=x+2y²-9z²) 9x2-7y2+9z3 (w=9x²-7y²+9z³) 4x+7y+1z2 (w=4x+7y+z²) Or even extreme: 15x5+78y9+4z7 (w=15x⁵+78y⁹+4z⁷)
