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8
(10 + x + 8 + 4 + 2x + 7 + 6 + 3) = 6,25 x 8
(10 + x + 8 + 4 + 2x + 7 + 6 + 3) = 50
38 + 3x = 50
3x = 50 - 38
3x = 12
x = 12/3
x = 4 (B)