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