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lo hice enuna hoja te envvio foto saludos.
7.3ˣ.3 - 3ˣ.3⁴ = 5ˣ.5² - 5ˣ.5³
3ˣ(7.3 - 3⁴ ) = 5ˣ(5² - 5³) -------> factorizando 3ˣ y 5ˣ
3ˣ(21-81) = 5ˣ(25 - 125)
3ˣ(-60) = 5ˣ(-100)
3ˣ/5ˣ = (-100)/(-60) ------>simplificando 20ava y el signo menos
3ˣ/5ˣ = 5/3
(3/5)ˣ = (3/5)⁻¹
x = -1