Answer:
7 -10 -30 -53
Explanation:
47-2 = 45
45-5 = 40 (2+3=5)
40-8 = 32 (5+3=8)
32-11 = 21(8+3=11).........
21-14 = 7
7-17 = -10
-10 -20 = -30
-30-23 = -53
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