The answer is:
180°
Hope this helped! <3
The sum of angles on a straight line is always 180 degrees.
Jessica's result means that any value of x (or any variable she used) would not be a solution to the equation. When something like 0 = 2 comes up, they answer is no solution.
For Your Information:
If you get 2=2 or 0=0 or anything like that, the solutions are all real numbers. Any value of x (or any variable used) will be a solution to the equation.
Please comment to let me know you understand. I hope this was helpful!