Difficulty Level: Very Hard
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In the stack of cubes below, the green number on the top of each column of cubes represents the positive value assigned to each cube in the column whereas the red number on the sides represents the negative value assigned to each cube in the row. To get the total value of a cube you subtract the negative value from the positive. So, the top cube would be 4 - 2 = 2. The total value of the stack of cubes is 17. What is the missing value?
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