Respuesta :
- 15 - 3q + 6 = 9 (re-arrange)
- 15 + 6 - 3q = 9 (add)
- 21 - 3q = 9 (subtract -21 from both sides)
- -3q = 9 - 21 (add)
- -3q = -12 (divide both sides by -3)
- q = +4
Hope I helped, as an Ambitous rank a brainliest mark would mean the world to me. Now go get that A!