ada yang tau nomor 18 bagaimana caranya?

∠CAE = ∠BCA,
thus, 46 + 3z = 115°
3z = 69
z = 23

∠BCA + ∠ACD = 180°
so, 115 + 13y = 180
13y = 65
y = 5

∠DAE = ∠D
then, 46 = 2x
x = 23

23 + 5 + 23 = 51
Thus, value of x + y + z is equal to 51