from the sum of 3 x square - 5 x + 2 and minus 5 x square - 8 x + 64 x square - 9 X + 7
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Step-by-step explanation:
3x²-5x+2-(5x²-8x+64x²-9x+7)
3x²-5x+2-(5x²+64x²-8x-9x+7)
3x²-5x+2-(69x²-17x+7)
3x²-5x+2-69x²+17x-7
3x²-69x²-5x+17x+2-7
-66x²+12x-5
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