tolong bantu pake cara yaaaa

Kesebangunan

12 : 9 = x + 4 + 4 : x + 4
12 : 9 = x + 8 : x + 4

*kali silang*

9(x + 8) = 12(x + 4)
9x + 72 = 12x + 48
12x - 9x = 72 - 48
3x = 24
x = 24 ÷ 3
x = 8 cm

Jawabannya A.