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Simplify combining like terms: (iii) p - (p - q)

Q. 1.     Simplify combining like terms:

             (iii)  p-(p-q)-q-(q-p)

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p - (p - q) - q - (q - p)

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

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

= p - q

The simplified expression is p - q.

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