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C)
-1-(-9)+(-8)
-1+9-8
9-9
0
------------
d)
-1-(7-10)+5
-1-7+10+5
-8+15
7
------------
e)
73-(-7-22+49)
73+7+22-49
102-49
53
-----------
f)
(-2+(-3))-(5-(-4))
(-2-3)-(5+4)
-5-9
-14
saludos