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BC= 14 - x / 18 - 2x = 10
CD= 2x= 8
BC= 14 - x = 18 - 2x
x = 4
AB es igual a 4 unidades
ESPERO QUE TE SIRVA!!!
A B C D
a + b = 14
b + 2a = 18
b + a + a = 18
14 + a = 18....a = 4
Espero haberte ayudado.