Which practice continued in the south long after it had largely vanished in the north?

The practice that continuously happen in the South even after the largely vanished in the North is Dueling. This is a way of having to engage combat between two people in which they have weapons and rules provided in means of honorable conditions.

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for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation: