If $3a + b + c = -3, a+3b+c = 9, a+b+3c = 19$, then find $abc$.
Question:
If $3a + b + c = -3, a+3b+c = 9, a+b+3c = 19$, then find $abc$.
Answer:
Let's think step by step.

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If $3a + b + c = -3, a+3b+c = 9, a+b+3c = 19$, then find $abc$.
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