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Plot3D ? or sth


Hi,
14th II is comming so I thought to draw some hearts, i know the formula
but i don't know how to draw it using mathematica, could anyone help me
with it ?

Here's formula:  (2x^2 + y^2 + z^2 -1)^3 = a*x^2*z^3 -y^2*z^3, where a is
a real-noumber value.

Chris




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