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5 * 5 - 8 = 17

4 * 5 - 7 = 13

3 * 6- 12 = 6

4 * 4 - 6 = 10

? = 4


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17 + 8 = 25 ÷ 5 = 5

13 + 7 = 20 ÷ 5 = 4

6 + 12 = 18 ÷ 6 = 3

10 + 6 = 16 ÷ 4 = 4

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