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6x2-5x-21 = (3x-7)(2x+3)
No. 3x plus 2x = 5x. 3x multiplied by 2x = 6x²
5x3 - 3x2 + 2x = x*(5x2 - 3x + 2) The quadratic has no real factors.
5x - 2x = 3x
2x + 3x = 5x