Respuesta :

Answer:

  13

Step-by-step explanation:

In order to make the equation true, the blank must be filled with a number that gives 78 when it is multiplied by 6. The missing number can be found as ...

  78/6 = 13

The value that makes the equation true is 13.

  42 +78 = 6(7 +13)

_____

Simplifying gives ...

  120 = 6(20)