Question

2a - 4c = 20
-3a+b-4c=20
- 4a + 2b + 3c = -15

Answer 1

Answer: 15-9a+b+3c

Step-by-step explanation:

~ 2a-4c = 20-3a+b-4c = 20-4a+2b+3c = -15

~ 20-5a+b=20-4a+2b+3c=-15

~ -9a+b+3c = -15

~ 15-9a+b+3c

Answer 2

Answer: 15-9a+b+3c

Step-by-step explanation:

~ 2a-4c = 20-3a+b-4c = 20-4a+2b+3c = -15

~ 20-5a+b=20-4a+2b+3c=-15

~ -9a+b+3c = -15

~ 15-9a+b+3c