Respuesta :

-2

Replace u by -2, and check if the equality remains

1-9u = 19

1-9(-2) = 19

1-(-18)=19

1+18 = 19

19=19

-2 YES

7

1- 9(7) = 19

1-63 = 19

-62=19

NO

0

1-9(0) = 19

1= 19

NO

6

1-9(6) = 19

1-54=19

-53=19

NO

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