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1-x6(x^-2.7-x^-2.3)(x^-3.3+x^-2.9+x^-2.5) =
= 1+(-x8+3.3x7-x8+2.9x7-x8+2.5x7+2.7x7-8.91x6+2.7x7-7.83x6+2.7x7-6.75x6+x8-3.3x7+x8-2.9x7+x8-2.5x7+2.3x7-7.59x6+2.3x7-6.67x6+2.3x7-5.75x6) =
= 1-x8+3.3x7-x8+2.9x7-x8+2.5x7+2.7x7-8.91x6+2.7x7-7.83x6+2.7x7-6.75x6+x8-3.3x7+x8-2.9x7+x8-2.5x7+2.3x7-7.59x6+2.3x7-6.67x6+2.3x7-5.75x6 =
= 15x7 – 43.5x6 + 1
= 1+(-x8+3.3x7-x8+2.9x7-x8+2.5x7+2.7x7-8.91x6+2.7x7-7.83x6+2.7x7-6.75x6+x8-3.3x7+x8-2.9x7+x8-2.5x7+2.3x7-7.59x6+2.3x7-6.67x6+2.3x7-5.75x6) =
= 1-x8+3.3x7-x8+2.9x7-x8+2.5x7+2.7x7-8.91x6+2.7x7-7.83x6+2.7x7-6.75x6+x8-3.3x7+x8-2.9x7+x8-2.5x7+2.3x7-7.59x6+2.3x7-6.67x6+2.3x7-5.75x6 =
= 15x7 – 43.5x6 + 1
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