besar sudut CBD adalah.......

2x + 5 + 3x - 25 = 180
5x - 20 = 180
5x = 180 + 20
5x = 200
x = 200 ÷ 5
x = 40

CBD = 2x + 5
= 2 × 40 + 5
= 80 + 5
= 85

Maaf kalo salah

CBD + DBA = 180° --> Sudut berpelurus
2x + 5° + 3x - 25° = 180°
5x - 20° = 180°
5x = 200°
x = 40°

CBD = 2x + 5 = 2.40 + 5 = 80+5 = 85°

Semoga Bisa Bantu :)