Respuesta :

Answer:

x = -19

Step-by-step explanation:

We know the value of y which is y = 3x - 12.

So, we can substitute it in the given equation,

2x - y = 7

=> 2x - 3x - 12 = 7

=> 2x - 3x = 7 + 12

=> -x = 19

=> x = -19

Hope you understood!!