If 2a + 3b -c =a + 2b + c =3a -b - c th...

If `2a + 3b -c =a + 2b + c =3a -b - c` then what is the ratio of a:b:c?

A

`4 : 1 : 5 `

B

` 8 : 2 : 5 `

C

` 4 : 2 : 1 `

D

`8 : 2: 1 `

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