7x - (5x - 2x² +13) = 2x²- 8x + 5
7x - 5x + 2x² - 13 = 2x² - 8x + 5
7x - 5x + 2x² - 2x² + 8x = 5 + 13
10x = 18 || : 10
х = 1,8
Ответ: 1,8
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7x - (5x - 2x² +13) = 2x²- 8x + 5
7x - 5x + 2x² - 13 = 2x² - 8x + 5
7x - 5x + 2x² - 2x² + 8x = 5 + 13
10x = 18 || : 10
х = 1,8
Ответ: 1,8