115. What should be added to 4c (– a + b + c) to obtain 3a (a + b + c) – 2b (a – b + c)?

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115. What should be added to 4c (– a + b + c) to obtain 3a (a + b + c) – 2b (a – b + c)?
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115. What should be added to 4c (– a + b + c) to obtain 3a (a + b + c) – 2b (a – b + c)? 115. What should be added to 4c (– a + b + c) to obtain 3a (a + b + c) – 2b (a – b + [...]
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