nilai x pada gambar diatas adalah?

AQ/QM = AP/PB
2/3 = AP/ 3.9
= 3.9 x 2 = 3x
= 7.8 = 3x
= 7.8/3 = x
= 2.6 = x

2/2+3 = x/x+3,9
2/5 = x/x+3,9
2x+7,8 = 5x
3x = 7,8
x = 2,6