Question

simplyfy p-(p-q)-(q-p)-q

Answer 1

p - ( p - q ) - q - ( q - p )

= p - p + q - q - q + p

= p - p + p + q - q - q 

= p - q

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Answer 2

p-(p-q)-(q-p)-q
=>p-p+q-q+p-q
=>(p-p+p)+(q-q-q)
=>(2p-p)+(q-2q)
=>p+(-q)
=>p-q

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