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7ˣ(5ˣ+2ˣ) / 3ˣ(5ˣ+2ˣ) = 3/7 , simplificamos lo comun y queda
7ˣ/3ˣ = 3/7
(7/3)ˣ = (7/3)⁻¹ , de aqui por teoria de exponentes se tiene
x = -1