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1. Multiplying 25 by 3 and 75 by 1:
(25)(3) + (75)(1) = 75a - 25b
2. Multiplying 75 by 1 and 25 by 3:
(75)(1) - (25)(3) = 75a - 25b
3. Multiplying 50 by 1.5 and 25 by 0.5:
(50)(1.5) + (25)(0.5) = 75a - 25b