The error is in step 2. if you are performing an operation on one side of the equation, it must be performed on the entire expression. you can’t only divide by 2 on one term, you must do it to everything in the equation. instead, you could add 6 to both sides first, giving you 2x = -4. Then you can divide by 2 on both sides. the answer is -2.
The answer to the question
None, a triangle need to have angles measuring 180 degrees , its only possible if the triangle has three angles equaling 60
A. is the correct one I did it on my test and got it right