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x in (-oo:+oo)
(2/3)^2*x = (27/8)^3 // - (27/8)^3
(2/3)^2*x-(27/8)^3 = 0
4/9*x-19683/512 = 0 // + 19683/512
4/9*x = 19683/512 // : 4/9
x = 19683/512/4/9
x = 177147/2048
x = 177147/2048
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