Bantuin yah... Thanks...

Bab Kesebangunan dan Kongruensi

AP/AQ = AB/AM
x/2 = (x + 3,9)/5
5x = 2(x + 3,9)
5x = 2x + 7,8
5x - 2x = 7,8
3x = 7,8
x = 7,8/3
x = 2,6 cm