How to find the eccentricity of this conic?
$4(2y-x-3)^2-9(2x+y-1)^2=80$
My approach :
I rearranged the terms and by comparing it with general equation of 2nd degree, I found that its a hyperbola. Since this hyperbola is not in standard form $x^2/a^2-y^2/b^2= 1$, I don't know how to find its eccentricity.
Please guide me.