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plot (-3x^5 + 2x^4 -7x^3 + 6x^2 + 2x – 5,-3 x^5} from x=10, 40
plot (-3x^5 + 2x^4 -7x^3 + 6x^2 + 2x – 5,-3 x^5} from x=10, 40
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