3x2-(2x2-8x)-(x2-3)=x
3x^2 - 2x^2 + 8x - x^2 + 3 = x
x^2 + 8x - x^2 + 3 - x = 0
7x + 3 = 0
7x = - 3
x = - 3/7
Оцени ответ
3x^2 - 2x^2 + 8x - x^2 + 3 = x
x^2 + 8x - x^2 + 3 - x = 0
7x + 3 = 0
7x = - 3
x = - 3/7