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plot( 8,8 * 10^(-4 )*x^4 - 0.0034x^3 + 0.37 x^2 - 6.7x + 170)
plot( 8,8 * 10^(-4 )*x^4 - 0.0034x^3 + 0.37 x^2 - 6.7x + 170)
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