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