Respuesta :

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

angelicsoul

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

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