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Soccer ball represents 6:

6 + 6 + 6 = 18

18 is a composite number that factors into 1, 2, 3, 6, 9 and 18. We can divide 18 by 3 to get 6 for repeated subtraction: 18 - 6 - 6 - 6 = 0.

Clock represents 3:

3 + 3 + 3 = 9

9 factors into 1, 3 and 9. Again, there are three in the group so 9 / 3 is 9 - 3 - 3 - 3 = 0.

Plant represents 4:

4 x 4 - 4 = 12

x squared minus x: x(x-1) = 12
4(4-1) = 12

Therefore, Clock x Soccer ball - Plant represents:

3 x 6 - 4 = 14

? = 14

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