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`|[a, a+2b, a+2b+3c], [3a, 4a+6b, 5a+7b+9c], [6a, 9a+12b, 11a+15b+18c]|=?`

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`|[a, a+2b, a+2b+3c], [3a, 4a+6b, 5a+7b+9c], [6a, 9a+12b, 11a+15b+18c]|=?`
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Apply `R_(2) to R_(2) -3R_(1) " and "R_(3) to R_(3) - 6R_(1)`
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