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If x = 1, y = 1 is a solution of equation 9ax + 12ay = 63 then, the value of a is (A) -3 (B) 3 (C) 7 (D) 5

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If x = 1, y = 1 is a solution of equation 9ax + 12ay = 63 then, the value of a is 

(A) -3 (B) 3 (C) 7 (D) 5 

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The correct option is (B).
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