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=> (45p - 15q + 21r) - (15p - 10q - 10r)
=> 45p - 15p - 15q + 10q + 21r + 10r
=> 30p - 5q + 31r
=(45p - 15q + 21r) - (15p - 10q - 10r)
=(45p - 15p)+(- 15q + 10q) + (21r + 10r)
=30p - 5q + 31r