Solution
Divisibility rule by 9, if the sum of all number is divisible by 9 then number is divisible by 9.
Sum of number = 6 + 8 + 7 + x + 2 + 9 = 32 + x
putting the value of x = 4
32 + 4 = 36 divisible by 9 so,
zx = 2 $$\times$$ 4 = 8
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