Question

x+287+888-8x+x(x+10-7x)=0

Answer 1

х + 287 + 888 -8х + х(х + 10 - 7х) = 0
1175 - 7х + х^2 + 10х - 7х^2 = 0
3х - 6х^2 = -1175
-3 * (2х^2 - х) = -1175
2х^2 - х = 391$frac{2}{3}$

Answer 2

x+287+888-8x+x^2+10x-7x^2=0
x^2-7x^2+x-8x+10x+287+888=0
-6x^2+3x+1175=0
Д=3^2-4*(-6)*1175=9+28200=28209
х1,2= (-3 +/-  корень квадр. из 28209)/(2*(-6))
х1=-13.746279
х2=14.246279