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a) 9
b) -2
c) -6
d) 7
e) -20
f) 21
27.
a) 7
b) -6
c) 7
d) -8
e) -32
f) -7
g) -6
h) 10
28. -3
29.
a) 15 : -3
b) -16 : -2
c) -14 : 7
d) -81 : -9
e) 200 : -2
f) -99 : -9