What is the value for each square if the total was 84?

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7
10
12
21

If the total value of all the squares is 84, and the value for each square is the same, then we can divide 84 by the total number of squares to find the value for each square.

The total number of squares is given as 4.

84 / 4 = 21

Therefore, each square has a value of 21.