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x in (-oo:+oo)
9*x = 1/243 // - 1/243
9*x-(1/243) = 0
9*x-1/243 = 0
9*x-1/243 = 0 // + 1/243
9*x = 1/243 // : 9
x = 1/243/9
x = 1/2187
x = 1/2187
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