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x in (-oo:+oo)
(2/5)^3*x = 4/25 // - 4/25
(2/5)^3*x-(4/25) = 0
(2/5)^3*x-4/25 = 0
8/125*x-4/25 = 0 // + 4/25
8/125*x = 4/25 // : 8/125
x = 4/25/8/125
x = 5/2
x = 5/2
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