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R in (-oo:+oo)
R^5 = 1/243 // - 1/243
R^5-(1/243) = 0
R^5-1/243 = 0
1*R^5 = 1/243 // : 1
R^5 = 1/243
R^5 = 1/243 // ^ 1/5
R = 1/3
R = 1/3
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