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x in (-oo:+oo)
(3/5)^-4*x = 4 // - 4
(3/5)^-4*x-4 = 0
625/81*x-4 = 0 // + 4
625/81*x = 4 // : 625/81
x = 4/625/81
x = 324/625
x = 324/625
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