Question

simplify :
p-(p-q)-(q-p)-q​

Answer 1

• Solution

→ p - (p - q) - (q - p) - q

→ p - p + q - q + p - q

→ p - p + p + q - q - q

→ p + q - q - q

→ p - q

Answer 2

$p-(p-q)-(q-p)-q \\ p - p + q - q + p - q \\ p - p + p + q - q - q \\ by \: cancelling \: you \: get \\ = p - q$

Hope this will be helpful.