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8 xy * - x  = - 8 x²y

6ac - ( - 6ac) = 6 ac + 6 ac = 12 ac

3 a * ( - 7 a) = - 21 a²

b² * b ⁵ = b ⁷

3 ac * 8a = 24 a²c

3 t - 21 t = - 18 t

9 x + 3 x - 4 x² + 6 x - 7 x² = - 11 x² + 18 x

- b * b * 5 b²  = -  b² * 5 b = - 5 b ³

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