Answer:
a = -6
Step-by-step explanation:
-5a-9+a=15
Combine like terms
-5a+a -9 = 15
-4a -9 = 15
Add 9 to each side
-4a -9+9 = 15+9
-4a = 24
Divide by -4
-4a/-4 = 24/-4
1. Combine like terms: -4a – 9 = 15
2. Use the additive property of equality to add 9 to both sides: -4a = 24
3. Use division property of equality to divide -4 on both sides: a = -6
