Find the equation of the lines bisecting the angles between the following pairs of straight lines, writing first the bisector of the angle in which the origin lies:

a) x) y = 0 and 2x + 3y = 6
b) 3x + 4y = 12 and 5x) 2y = 8
c) 2x) 5y = 10 and 4x + y = 8
d) x + 2y = 4 and 3x) y = 6