Simplify: P + (− Q − R − S) − (P − Q − R)

Simplify:

p + (− q − r − s) − (p − q − r)

Sum

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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