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x in (-oo:+oo)
3*x = 1/729 // - 1/729
3*x-(1/729) = 0
3*x-1/729 = 0
3*x-1/729 = 0 // + 1/729
3*x = 1/729 // : 3
x = 1/729/3
x = 1/2187
x = 1/2187
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