Answer: Clara's answer is not reasonable, the correct answer is -42.
Explanation:
Multiplying by an odd amount of negative numbers makes your answer a negative number, and multiplying by an even amount of negative numbers makes your answer a positive number. For example, in this problem, we are multiplying 3 negative numbers, which means our answer will be odd, and -6x-7 is 42, and multiplying by -1, you get your final answer of -42. If you need more clarification or help just let me know.