. (5x-3)(x + 4)-(2x + 5)(3x - 4)
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=> 5x(x + 4) - 3(x + 4) - 2x(3x - 4) + 5(3x - 4)
=> 5x²+20x - 3x - 12 - 6x²+ 8x + 15x - 20
=> 5x²- 6x²+20x - 3x +8x + 15x - 12 - 20
=> - x²+ 40x-32
I hope it helps you.
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