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प्रश्न
Subtract: m + n from 3m – 7n
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उत्तर
3m – 7n – (m + n) = 3m – 7n + (– m – n)
= 3m – 7n – m – n
= (3m – m) + (– 7n – n)
= (3 – 1)m + (– 7 – 1)n
= 2m + (– 8)n
= 2m – 8n
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