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x in (-oo:+oo)
3^3*x = 1/27 // - 1/27
3^3*x-(1/27) = 0
3^3*x-1/27 = 0
27*x-1/27 = 0 // + 1/27
27*x = 1/27 // : 27
x = 1/27/27
x = 1/729
x = 1/729
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