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प्रश्न
Simplify:
p + (− q − r − s) − (p − q − r)
योग
उत्तर
p + (− q − r − s) − (p − q − r)
= p − q − r − s − p + q + r
= p − p − q + q − r + r − s
= − s
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Concept of Substitution
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