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x + x + 2 + x + 4 + x + 6 + x + 8 = 8(5)
5x + 20 = 40
5x = 40 - 20
5x = 20
x = 4
data
4, (4 + 2), (4 + 4), (4 + 6), (4 + 8)
4, 6, 8, 10, 12
mean = (4 + 6 + 8)/3
= 18/3
= 6