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x in (-oo:+oo)
9*x = 1/729 // - 1/729
9*x-(1/729) = 0
9*x-1/729 = 0
9*x-1/729 = 0 // + 1/729
9*x = 1/729 // : 9
x = 1/729/9
x = 1/6561
x = 1/6561
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