Inverse
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Inverse Cartesian functions (x = ) can be entered as

x = 3y2+3y-4

or

3y2+3y-4

the x = is optional


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FX Graph will rearrange functions if possible. 3xy + y = 4x will be internally rearranged into y = 4x/(3x+1) to provide access to more of FX Graph's features.