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प्रश्न
If A’s age is ‘n’ years now, 7 years ago A’s age was _____________
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उत्तर
If A’s age is ‘n’ years now, 7 years ago A’s age was n − 7
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अध्याय 2: Introduction to Algebra - Exercise 2.1 [पृष्ठ ४०]
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