Can you guess the missing number with logic?

Can you guess the missing number with logic? Please comment.. We are waiting for Math genius

Answer :

This brain teaser requires you to observe the number and find-out the logic. Look carefully the number in the center circle of each line is half the sum of numbers towards its left and right. So, for the last line, the answer will be: 9 + 3 = 12 (÷ 2) = 6.