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= (2x+5) + (4x-9) + (10-x)
= 2x + 4x - x + 5 - 9 + 10
=5x + 6
= AB + BC + CA
= (2x + 5) + (4x - 9) + (10 - x)
= (2x + 4x - x) + (5 - 9 +10)
= 5x + 6