Question

Simplify : p + (p – q) + q + (q – p)​

Answer 1

$\rm{p + (p - q) + q + (q - p) = p + p - q + q + q - p}$

$\longrightarrow\rm{p + (p - q) + q + (q - p) = p + p - p - q + q + q}$

$\longrightarrow\rm{p + (p - q) + q + (q - p) = p + q}$