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-21 + 7 - 28 -12
-14 -40
-54
b. [-23+(2*(-8)-5)+12]-15
[-23 +(-16 - 5) + 12]-15
[-23 -21 +12]-15
[-24 + 12] - 15
-12 - 15
-27
c. [12 *(-3) +8 -12 - (-6 + 2)] + 2
[-36 +8 - 12 -(-4)] + 2
[-28 - 12 + 4] + 2
[-40 + 4] + 2
-36 + 2
-34
b=-47
c=-34
espero ayudarte