The vertices `Ba n dC`
of a triangle `A B C`
lie on the lines `3y=4xa n dy=0`
, respectively, and the side `B C`
passes through the point `(2/3,2/3)`
. If `A B O C`
is a rhombus lying in the first quadrant, `O`
being the origin, find the equation of the line `B Cdot`