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-2-1=-3
b) \frac{-2-(-3)}{11}= \frac{-2+3}{11}= \frac{1}{11}
c) \frac{10-2}{0} = \frac{8}{0} no tiene solucion
d) -4*10=-40
e) \frac{8}{-1}
f) no tiene solucion