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DE LA FIGURA, SE OBSERVA:
TRIÁNGULO ABE ES ISÓSCELES (APLICAMOS ÁNGULOS ALTERNOS INTERNOS)
LUEGO: AB = AE
AE = 7
POR OTRO LADO:
AD = 9
AE + ED = 9
7 + x = 9
x = 2
ESO ES TODO, SALUDOS................