Hola amigos por favor ayúdenme en la solución del siguiente caso?

Nose si me equivoco = D

<img src="https://tex.z-dn.net/?f=%5Cmathrm%7B%5Clarge%7BDatos%3A%7D%7D%5C%5C%206%28AB%29%28CD%29%3D%28BC%29%28AD%29%5C%5C%20%5C%5C%20%5Cfrac%7B1%7D%7B8%7D%3D%5Cfrac%7B6%7D%7B%28AD%7D%2B%5Cfrac%7B1%7D%7B%28AB%29%7D" />

del primer dato :

<img src="https://tex.z-dn.net/?f=%206%28AB%29%28CD%29%3D%28BC%29%28AD%29%5CLongrightarrow%206%5Cfrac%7B%28AB%29%7D%7B%28AD%29%7D%3D%5Cfrac%7B%28BC%29%7D%7B%28CD%29%7D" />

del segundo dato :

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B8%7D%3D%5Cfrac%7B6%28AB%29%2B%28AD%29%7D%7B%28AD%29%28AB%29%7D%5C%5C%20%5C%5C%20%5CLongrightarrow%20%5Cfrac%7B%28AD%29%28AB%29%7D%7B8%7D-%28AD%29%3D6%28AB%29%5C%5C%20%5C%5C%20%5CLongrightarrow%20%5Cfrac%7B%28AB%29-8%7D%7B8%7D%3D6%5Cfrac%7B%28AB%29%7D%7B%28AD%29%7D%20" />

<img src="https://tex.z-dn.net/?f=%5Cmathrm%7B%5Clarge%7Bigualando%3A%7D%7D" />

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%28BC%29%7D%7B%28CD%29%7D%3D%5Cfrac%7B%28AB%29-8%7D%7B8%7D%5CRightarrow%20CD%3D%5Cfrac%7B8%28BC%29%7D%7B%28AB%29-8%7D" />

<img src="https://tex.z-dn.net/?f=%5Cmathrm%7B%5Clarge%7BRespuesta%3A%7D%7DCD%3D%5Cfrac%7B8%28BC%29%7D%7B%28AB%29-8%7D" />.