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A=L^{2}
RESOLUCIÓN:
3L^{2} = 21L
L^{2} = 7L
L^{2} / L = 7
L = 7
COMPROBACIÓN:
Area: L^{2} = 7^{2} = 49
Triple del área: 147
longitud del lado: L = 7
21 veces el lado: 21(7) = 147
147 = 147