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R in (-oo:+oo)
R^7+5/8 = 0
1*R^7 = -5/8 // : 1
R^7 = -5/8
R^7 = -5/8 // ^ 1/7
R = -(5/8)^(1/7)
R = -(5/8)^(1/7)
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