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= (2m^2 + 5m^2 + 8m^2 + 10m^2) - 8m^2
= 25m^2 - 8m^2
= 17m^2
(2) 2X + 3Y - 8Y + Y
= 2X + (3Y + Y) - 8Y
= 2X + 4Y - 8Y
= 2X - 4Y