Average= Sum of numbers divided by how many numbers there are.
So,
Sum of numbers = 9+23+32=64
Average = 64/3=21.33
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9
41
-23 is the sum of -32 and 9
h + 23 = 32 Subtract 23 from both sides: h = 32 - 23 = 9
32, 9, 18, 51