Giải phương trình:
a) \(x^2-3x-5\sqrt{9x^2+x-2}=\dfrac{3}{4}x+6\)
b) \(\sqrt{\left(x+1\right)\left(2-x\right)}=1+2x-x^2\)
c) \(2x^2+\sqrt{1-x}+2x\sqrt{1-x^2}=1\)
d) \(\left(\sqrt{x^2+1}-x\right)^5+\left(\sqrt{x^2+1}+x\right)^5=123\)
e) \(1+x-2x^2=\sqrt{4x^2-1}-\sqrt{2x+1}\)