यदि 9a^(2) + 4b^(2) + c^(2) + 21 = 4 (3a...

यदि `9a^(2) + 4b^(2) + c^(2) + 21 = 4 (3a + b -2c )`, तो `(9a + 4b -c)` का मान है:

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