Giải các phương trình sau :
a) \(\left(x+2\right)\left(x^2-3x+5\right)=\left(x+2\right)x^2\)
b) \(\dfrac{-7x^2+4}{x^3+1}=\dfrac{5}{x^2-x+1}-\dfrac{1}{x+1}\)
c) \(2x^2-x=3-6x\)
d) \(\dfrac{x-2}{x+2}-\dfrac{3}{x-2}=\dfrac{2\left(x-11\right)}{x^2-4}\)