ಒಂದು ವೇಳೆ a2 + b2 + 49c2 + 18 = 2(b + 28c - a) ಆಗಿದ್ದರೆ,  (2a - b + 7c) ಮೌಲ್ಯವು ಎಷ್ಟು?

1
5
2
-3
3
-4
4

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