3/1+x+x^2 = 3 - x - x^2

3+x+x^2-3+x+x^2=0 2x^2+2x=0 2x(x-1)=0 x=0 x=-1

[latex] \frac{3}{1}+x+ x^{2}=3-x- x^{2} [/latex] [latex]x^{2}+x+3=- x^{2}-x+3[/latex] [latex] x^{2}+x+3+ x^{2}+x-3=0[/latex] [latex]2 x^{2}+2x=0 [/latex] [latex]2x(x+1)=0[/latex] [latex]2x=0[/latex]      [latex]x+1=0[/latex] [latex] x_{1}=0 [/latex]      [latex]x_{2}=-1[/latex]  Ответ: [latex] x_{1}=0 [/latex];  [latex]x_{2}=-1[/latex]