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x in (-oo:+oo)
3^4*x = 1/27 // - 1/27
3^4*x-(1/27) = 0
3^4*x-1/27 = 0
81*x-1/27 = 0 // + 1/27
81*x = 1/27 // : 81
x = 1/27/81
x = 1/2187
x = 1/2187
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