PLISS BANTU.. MAU UN

CD/CB = DE/AB
12/12+BD = 6/8
6(12+BD) = 12.8
6(12+BD) = 96
12+BD = 96/6
12+BD = 16
BD = 16-12
BD = 4 cm

[tex] \frac{12}{x} = \frac{6}{8} [/tex]
              72 + 6x = 96
                      6x = 96-72
                      6x = 24
                        x = [tex] \frac{24}{6} [/tex]
                        x = 4