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6 .   F i n d   t h e   v a l u e   o f   x   f o r   w h i c h   x - k y = 2 ,   3 x + 2 y = - 5   h a v e   u n i q u e   s o l u t i o n . 8 .   S o l v e : - a + c x - a - c y = 2 a b a + b x - a - b y = 2 a b

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