In the above picture, one number is missing which is represented as a question mark. Find a appropriate number which can replace the question mark.

The missing number is 6
Number in block= summation of number in left sum – summation of number in right sum
(5+4+3+2) – (3+2+6+7)=4
(9+2+7+3) – (5+1+6+3)=6

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