Question 856706
{{{x^2-4y^2-4x-8y=36}}}
{{{x^2-4x-4(y^2+2y)=36}}}
{{{(x^2-4x+4)-4(y^2+2y+1)=36+4-4}}}
{{{(x-2)^2-4(y+1)^2=36}}}
{{{(x-2)^2/36-(y+1)^2/9=1}}}