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2b = a+6 ec. 2
Sustituyendo valores de la ec. 2 en al ec. 1
2a + a+6 = 30
3a = 30-6
3a = 24
a = 24/3
a = 8
De la ec. 2:
2b = a+6
2b = 8+6
2b = 14
b = 14/2
b = 7
Las dimensiones del rectángulo son:
ancho = 8 cm
base = 7 cm
Saludos......