1
5 + 6 + 2 + 1 = 14
-5 plus 9n plus 6 is 1 plus 9n.
7 i think with math skills you infer its 7
-6 + 5 = -1
9 + 9 + 9 + 1 + 6 + 5 = 39
5/6 + 1/6 = 1
1
102
3 + 5 + 6 + 9 + 2 + 1 + 10 = 36
1 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 46
7-6=1, 1+5=6. 6 is your answer.