Respuesta :

Answer:

-784

Step-by-step explanation:

428 - ? = 1,212

428 - 1,212 = ?

428 - 1,212 = -784

? = -784

hope it helps!

Answer:

- 784

Step-by-step explanation:

428 - x = 1,212​

1,212 - 428 = - x

- x = 784

x = - 784