Question

look for a pattern and find the missing digit x. (compare the numbers in the outer columns with the numbers in the inner columns.)
the chart is:
row 1: 8, 6, 3, 9
row 2: 8, 3, 0, 6
row 3: 9, 7, 2, 9
row 4: 2, x, 6, 8

Explanation:

Step1: Sum first column values

$7 + 6 + 9 + 2 = 24$

Step2: Sum third column values

$3 + 8 + 2 + 4 = 17$

Step3: Sum fourth column values

$9 + 6 + 4 + 5 = 24$

Step4: Set second column sum equal to first/fourth column sum, solve for $x$

$6 + 3 + 7 + x = 24$
$16 + x = 24$
$x = 24 - 16$

Answer:

$8$