function-machine/subtraction/medium · סט 18

7 problems
1
Input: 3 → [×2] → ? =
2
? → [-3] → 7 =
3
Input: 1 → [×2 + 1] → ? =
4
Input: 1 → [?] → 3, what is the rule? =
5
Input: 4 → [×2 + 3] → ? =
6
? → [×2 + 3] → 21 =
7
Input: 9 → [?] → 19, what is the rule? =
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