George and Bella are asked to solve - 3x - 30 = 5x + 18. Identify where one of them made an error.
George
Bella
- 3x - 30 = 5x + 18
- 3x - 30 - 5x = 5x + 18 - 5x
-8x - 30 = 18
- 8x - 30 + 30 = 18 + 30
-8x = 48
Negative 8x over negative 8 equals 48 over negative 8
x = - 6
- 3x - 30 = 5x + 18
-3x - 30 - 3x = 5x + 18 - 3x
- 30 = 2x + 18
-30 - 18 = 2x + 18 - 18
- 48 = 2x
Negative 48 over 2 equals 2x over 2
x=-24
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