help please ASAP!! 12 points + brainliest

Answer:
x=20 and x=2 and 5. idk
Step-by-step explanation:
3. 2x=4x-40
-4x -4x
-2x=-40
-2x/-2=-40/-2
x=20
4. they are all eqaul so choose one line
4x=8
4x/4=8/4
x=2
plug all in so you can see the same anwsers
5. i dont know