Question 666609
{{{2by-2a= ay-4b}}} get the terms with y in them on one side. Move no y terms to the other side
{{{2by - ay = 2a - 4b}}} isolate y using distribution
{{{y(2b-a) = 2a - 4b}}} fully isolate y
{{{y = (2a-4b)/(2b-a)}}}