On a line, there are particles located at 3, 1, 1, 2, and 5. Their masses are

Question:

On a line, there are particles located at −3, −1, 1, 2, and 5. Their masses are 8, 2, 3, 2, and 1, respectively.
(a) What is the center of mass of the system?
(b) Keeping the other four masses the same, what would the mass at 5 need to be in order to have the center of mass be 0?

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