Question
Simplify:
p + (− q − r − s) − (p − q − r)
p + (− q − r − s) − (p − q − r)
✓
Answer
p + (− q − r − s) − (p − q − r)
= p − q − r − s − p + q + r
= p − p − q + q − r + r − s
= − s
= p − q − r − s − p + q + r
= p − p − q + q − r + r − s
= − s
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