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प्रत्येक समीकरण में a का मान ज्ञात करे त...

प्रत्येक समीकरण में `a` का मान ज्ञात करे ताकि उनका हल `x=1`, `y=1` हो |
`(i) x-y=a` `(ii) 3x+ay=6`
`(iii) 9ax+12ay=63` `(iv) 5x+2ay=3a`

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