tolong bantu!!!!!!!!

Sudut CBD
= 180° - ABD
= 180° - (4x + 20°)
= 160° - 4x

Sudut BDC
= 180° - CDE
= 180° - (4x - 5)
= 185° - 4x

Nilai x
35° + 160° - 4x + 185° - 4x = 180°
-8x = 180° - 375°
8x = 195
x = 200/8
x = 25

Maka, Sudut BDC
= 185° - 4(25)
= 185° - 100
= 85°