Which two equations can be used to determine the measure of these two adjacent angles?

2x+3=x−6
3x−3=180
(2x+3)−(x−6)=180
(x+6)−(2x+3)=180
(2x+3)+(x−6)=180

The equations that can be used to determine the measure of these two adjacent angles are:

2x + 3 = x - 6

and

(2x+3) - (x-6) = 180