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x in (-oo:+oo)
(2/3)^3*x = 8/27 // - 8/27
(2/3)^3*x-(8/27) = 0
(2/3)^3*x-8/27 = 0
8/27*x-8/27 = 0 // + 8/27
8/27*x = 8/27 // : 8/27
x = 8/27/8/27
x = 1
x = 1
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