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= x ( 2x +5) - (2x+5)
= (x-1)(2x+5)
2.15-x-6x^2/9x^2-25
= 6x^2 - x + 15 / 9x^2 - 25
= (2x+3) (3x-5) / (3x+5) (3x-5)
= (2x+3) / (3x+5)