3x + (x + 1)(x² - x + 1) - (-2 + x³) = 8.
3x + x³ - x² + x + x² - x + 1 + 2 - x³ = 8
3х + 3 = 8
3х = 8 - 3
3х = 5 |: 3
x = 1 ⅔
ответ: 1 ⅔.
3х+3=8
3х=5
х=5/3
х=1 2/3
3x + (x + 1)(x² - x + 1) - (-2 + x³) = 8.
3x + x³ - x² + x + x² - x + 1 + 2 - x³ = 8
3х + 3 = 8
3х = 8 - 3
3х = 5 |: 3
x = 1 ⅔
ответ: 1 ⅔.