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x in (-oo:+oo)
1/9 = 27^2*x // - 27^2*x
1/9-(27^2*x) = 0
1/9-729*x = 0 // - 1/9
-729*x = -1/9 // : -729
x = -1/9/(-729)
x = 1/6561
x = 1/6561
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