18 * b⁴ * (- 6) * (- 9) * b³ = 18 * (- 6) * (- 9) * b⁴ * b³ = 972 * b⁷ = 972 * (- 1/3)⁷ = 972 * (- 1/2187) = - 4/9
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18 * b⁴ * (- 6) * (- 9) * b³ = 18 * (- 6) * (- 9) * b⁴ * b³ = 972 * b⁷ = 972 * (- 1/3)⁷ = 972 * (- 1/2187) = - 4/9