since BD is the bisector of abc, both angles abd and cbd are equal to each other. The first step is to find the x, then you fill it in, in one of the angles. So:
5) 3x+6= 7x-18
3x-7x=-18-6
-4x=-24
x=6
angle abd: (and cbd)
(3×6+6)°
=(18+6)°
=25°
angle abc:
2×abd=50°
6) -4x+33=2x+81
-4x-2x=81-33
-6x= 48
x= -8
angle abd (and cbd):
(-4×-8+33)°
= (32+33)°
=65°
angle abc:
2×abd
= 130°
