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x in (-oo:+oo)
(1/5)^3*x = 729 // - 729
(1/5)^3*x-729 = 0
1/125*x-729 = 0 // + 729
1/125*x = 729 // : 1/125
x = 729/1/125
x = 91125
x = 91125
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