Abigail, Ben, Carmela, and David are standing in line, in that order, with Carmela halfway between Abigail and David. If the distance between Abigail and Ben is 3 feet, and the distance between Carmela and David is twice the distance between Carmela and Ben, which equation can be used to find the distance, x, in feet, between Abigail and David?

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

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