According to a theorem, "Sum of two sides of a triangle is always greater than its third side." Sum of the sides given:9x-6 So, option D is clearly ruled out. Also, option A is ruled out as 3x+2x-4=5x-4<9x-6(for x>1/2). Option C is also ruled out as 5x+2+2x-4=7x-2. Therefore, option B is correct.
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