Make it symmetrical in X-axis by using absolute function on x variable.
Change the sgn to equal (=) if you want a empty heart, change to greater (>) if you want outside filled.
The above graphs are generated using software GrafEq 2.13 which is a very powerful and efficient fomula-plotting tool, and can be downloaded from Grafeq/
You could also draw a heart using the CSS3.
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