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2.8x + (1/2)x(x/2.4)3 = (1/2)(2.4-x)[(2.4-x)/2.4]3 + (2.4-x)0.8
2.8x + (1/2)x(x/2.4)3 = (1/2)(2.4-x)[(2.4-x)/2.4]3 + (2.4-x)0.8
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