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If x^2+8y^2-12y-4xy+ 9 = 0, then the val...

If `x^2+8y^2-12y-4xy+ 9 = 0`, then the value of (7x - 8y) is:
यदि `x^2+8y^2-12y-4xy+ 9 = 0` ,तो (7x - 8y) का मान क्या होगा

A

12

B

5

C

9

D

21

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