Ответ: -0,25
[tex] - ( {x}^{2} - 2) - 0.3 + 7x + ( {x}^{2} - 0.2x) = 0 \\ - {x}^{2} + 2 - 0.3 + 7x + {x}^{2} - 0.2x = 0 \\ 6.8x + 1.7 = 0 \\ 6.8x = - 1.7 \\ x = - 0.25[/tex]
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Ответ: -0,25
[tex] - ( {x}^{2} - 2) - 0.3 + 7x + ( {x}^{2} - 0.2x) = 0 \\ - {x}^{2} + 2 - 0.3 + 7x + {x}^{2} - 0.2x = 0 \\ 6.8x + 1.7 = 0 \\ 6.8x = - 1.7 \\ x = - 0.25[/tex]