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Q.

If 3−2−12xy=11−5,  then 3x+7y=

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a

0

b

11

c

2

d

1

answer is C.

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Detailed Solution

3−2−12xy=11−5,3x−2y=11,−x+2y=−5 ⇒x=3,y=−1⇒3x+7y=9−7=2
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