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= 2x - 6y - 4x + 4y
= 2x - 4x - 6y + 4y
= -2x - 2y
b. p(q - r) + q(r - p) + r(p-q)
= (pq - pr) + (qr - pq) + (pr - qr)
= pq - pq - pr + pr + qr - qr
= 0