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x in (-oo:+oo)
9*x = (1/27)^3*x-4 // - (1/27)^3*x-4
9*x-((1/27)^3*x)+4 = 0
177146/19683*x+4 = 0 // - 4
177146/19683*x = -4 // : 177146/19683
x = -4/177146/19683
x = -39366/88573
x = -39366/88573
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