Inverse Cartesian 
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Inverse Cartesian functions (x = ) can be entered as
x = 3y2+3y4
or
3y2+3y4
the x = is optional
The graph tool will rearrange functions if possible. 3xy + y = 4x will be internally rearranged into y = 4x/(3x+1) to provide access to more of the graph tool's features.
