Answer:
-8
Explanation:
If you were to change the system into slope intercept you would get y=24+3x and -y=-24-3x. Then you would make the equation 24+3x=-24-3x. Then you would want to get all the variables on one side and the non variables on the other. Then you would get 48=-6x. From there you would divide -6x by -6 and get x. Then you do 48/-6 and get -8. So x=-8