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x in (-oo:+oo)
9^2*x = 1/3 // - 1/3
9^2*x-(1/3) = 0
9^2*x-1/3 = 0
81*x-1/3 = 0 // + 1/3
81*x = 1/3 // : 81
x = 1/3/81
x = 1/243
x = 1/243
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