решите уравнение:
1) [tex] \frac{2 x^{2} +7}{ x^{3}+1 } - \frac{2}{ x^{2} -x+1} = \frac{3}{x+1} [/tex]
2) [tex] \frac{2y-1}{ 14y^{2}+7y } - \frac{2y+1}{6y^{2} -3y} = \frac{8}{3-12 y^{2} } [/tex]
3) [tex] \frac{1}{ x+1 } - \frac{1}{x^{2} -3x+2} = \frac{6}{2-x- 2x^{2}+ x^{3} } } [/tex]