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a=largo b=ancho b=3a-42cm
P = 2a +2b = 60cm luego 2a + 2(3a-42cm) = 60cm
2a + 6a - 84cm = 60cm luego 8a -84cm = 60cm
8a = (60 +84)cm = 144cm entonces a = 144cm/8 = 18cm
entonces a = 18cm luego b= 3a-42cm = 3(18cm) - 42cm
entonces b = (54 - 42)cm = 12cm