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⁵√(- 128)/⁵√(- 4) + ⁷√(- 128)/⁹√(- 1) = ⁵√32 + ⁷√(- 128)/- 1 = 2 - ⁷√(- 128) =
= 2 - (- 2) = 2 + 2 = 4