Respuesta :

Answer:

3

Step-by-step explanation:

Answer:

x = 3

Step-by-step explanation:

  1. Subtract 1 from each side, so it now looks like this: -7x = -21
  2. Divide each side by -7 to cancel out the -7 next to x. It should now look like this: x = 3

I hope this helps!