Anna and Belle are asked to solve - 2x - 15 = 6x + 9. Identify where one of them made an error. Anna Belle - 2x - 15 = 6x + 9 - 2x - 15 - 6x = 6x + 9 - 6x - 8x - 15 = 9 - 8x - 15 + 15 = 9 + 15 - 8x = 24 Negative 8x over negative 8 equals 24 over negative 8 x = - 3 - 2x - 15 = 6x + 9 - 2x - 15 + 2x = 6x + 9 + 2x - 15 = 8x + 9 - 15 + 9 = 8x + 9 + 9 - 6 = 8x Negative 6x over 8 equals 8x over 8 Negative two-thirds
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