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x + y = 7 এবং x - y = 3 যোগ করলে কোন চলকটি অপসারিত হয়?

Aউভয়ই
Bকোনোটিই নয়
Cy
Dx
Answer & Solution
Correct answer: C. y
সমীকরণ দুটি যোগ করলে +y এবং -y পদ দুটি পরস্পর কেটে যায়।
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