Giải PT:
a) \(3x^2+2x^2+2x^{ }+3=0\)
b) \(\left(x^2+x+1\right)^2-\left(x^2+x+1\right)-12=0\)
c) \(\left(x^2+5x\right)^2-2x^2-10x=24\)
d) \(\left(x^2+3x-4\right)^3+\left(2x^2-5x+3\right)^3=\left(3x^2-2x-1\right)^3\)
e) \(\left(x-6\right)^4+\left(x-8\right)^4=16\)