Answer:
a = -3
Step-by-step explanation:
1) 3a + 6-6=a-6
2) 3a = a-6
3) 3a - a= a -6-a
4) 2a =a-6-a
2a= -6
5) 2a/ 2 = -6/2
6) answer a = -3
Hope that helps
Sorry if wrong