Explicación paso a paso:
1)
(-21)+(-6)= -27
2)
(-115)-(-30)-(6)
(-115)+(+30)+(-6)= -91
3) (-8)+(-9)+(+14)= -3
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Explicación paso a paso:
1)
(-21)+(-6)= -27
2)
(-115)-(-30)-(6)
(-115)+(+30)+(-6)= -91
3) (-8)+(-9)+(+14)= -3