tlng jawab pake cara ya makasih

2x + 3x-10 = 90 (siku")
kita cari x nya
5x -10 = 90
5x = 90+10
5x = 100
x = 100:5
x =20

besar sudut cbd
= 3x-10
= 3x(20) -10
= 60 -10
= 50

Dicari nilai x
Sudut ABD+sudut CBD=90°
2x+3x-10°=90°
5x-10°=90°
5x=90°+10°
5x=100°
x=100/5
x=20°

Sudut CBD=3x-10°
Sudut CBD=3(20)-10°
Sudut CBD=60°-10°
Sudut CBD=50°