Respuesta:
-11
Explicación paso a paso:
8+7= 15
15-12= 3
3-15= -12
-12+21= 9
9-18= -9
-9-2= -11
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Respuesta:
-11
Explicación paso a paso:
8+7= 15
15-12= 3
3-15= -12
-12+21= 9
9-18= -9
-9-2= -11