Question 312443
{{{(2b-8)/(b^2-16)=(2(b-4))/((b-4)(b+4))}}}
{{{(2b-8)/(b^2-16)=(2*cross(b-4))/(cross(b-4)(b+4))}}}
{{{(2b-8)/(b^2-16)=2/(b+4)}}}