Ответ:
(5x^2 + 6x - 3) - (2x^2 - 3x - 4) = 5x^2 + 6x - 3 - 2x^2 + 3x + 4 = 3x^2+ 9x + 1
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Ответ:
(5x^2 + 6x - 3) - (2x^2 - 3x - 4) = 5x^2 + 6x - 3 - 2x^2 + 3x + 4 = 3x^2+ 9x + 1