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Ancho= A = x
Perímetro = 2L + 2A = 2(L+A)
84 = 2(L+A)
42 = L + A
42 = 2x + x
42 = 3x
14 cm = x = Ancho
largo = 2x = 2(14) = 28 cm
Area= LxA
Area= 28x14
Area = 392