How do I write a code to chart functions in this form

After arrangement

2*x+xy = 4 >> y = (4-x)/x

3+xy +x = 0 >> y = -(3+x)/x

So I just want the user to enter the function, then excel will plot it.

I know how to plot the function after it has been rearranged, but what I

don't know is how to rearrange the function to plot it

Can anybody hep

Thanx

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