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CD = 20
CE = 15
BE =12
AD = 7x - 5
CD CE
----- = -------- Reemplazamos
DA EB
20 15
---------- = --------
7x - 5 12
20* 12 = 15(7x - 5)
240 = 105x - 75
240 + 75 = 105x
315 = 105x
315/105 = x
x = 3
AD = 7x - 5 = 7*3 - 5 = 21-5 = 16
Respuesta.
x = 3
AD = 16