a) 4 - ( -3 - 6 ) = 13

b) 6 + ( 4 - 8 ) = 2

c) 12 - ( 5 + 3 ) = 4

d) 8 - ( 1 - 9 ) = 16

e) 2 + ( -9 + 5 ) = -2

f) -15 - ( -3 - 7 ) = -5

g) 10 - ( 3 + 2 - 8 ) = 13

h) 30 - ( 18 - 27 ) = 39