0=x * y

0 == x * y

ContourPlot3D[ (x^2+9/4*y^2+z^2-1)^3-x^2*z^3-60/80*y^2*z^3 == 0, {x, -1.3, 1.3}, {y, -1, 1}, {z, -1, 1.4}, Mesh -> None, ContourStyle -> Directive[Opacity[0.9], Red]]

ContourPlot3D[ (x ^ 1000 + y^1000 + z^1000)^(1/1000) == 1, {x, -1.1, 1.1}, {y, -1.1, 1.1}, {z, -1.1, 1.1}]

ContourPlot3D[(x  + y+ z)== 1, {x, -11, 11}, {y, -11, 11}, {z, -11, 11}]