Answer :
3+4+7=__+6
7+7=__+6 because 3+4 = 7
14=__+6 because 7+7 = 14
14= 8 + 6 because 14 - 6 = 8, so 6+8 = 14
the answer is 8
7+7=__+6 because 3+4 = 7
14=__+6 because 7+7 = 14
14= 8 + 6 because 14 - 6 = 8, so 6+8 = 14
the answer is 8