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AC=b
AD=c
AC + AB =18
b+a =18
BD+CD=12
(c-a) + (c-b)=12
2c-a-b=12
2c-12 = a+b (reemplazando)
2c-12=18
2c=18+12
2c= 30
c= 30/2
c=15
AD= c ( y "C" vale 15)