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25x^2 + 15x + 15x + 9 = 25x^2 + 30x +9
(25x^2 + 30x +9) × (-5x-3) =
-125x^3 -27x^2 -150x^2 -90x -45x - 27 =
-125x^3 -177x^2 -135x -27