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A carpenter wants to construct a closed-topped box whose base length is 2 times the base...

A carpenter wants to construct a closed-topped box whose base length is 2 times the base width. The wood used to build the top and bottom costs $7 per square foot, and the wood used to build the sides costs $6 per square foot. The box must have a volume of 12 cubic feet. What equation could be used to find the smallest possible cost for the box?

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