giải các phương trình
1, $3(x+2\sqrt{x^{2}+1})=-3x^{2}-2\sqrt{3}x+3\sqrt{3}-1$
2, $x^{2}-4x=8\sqrt{x-1}$
3, $\sqrt{4x+1}-\sqrt{3x+4}=1$
4, $\sqrt{1-\sqrt{x^{3}-x}}+1=\sqrt{x}$
5, $\sqrt{x+1}+\sqrt{x+10}=\sqrt{x+2}+\sqrt{x+5}$
6, $(\sqrt{x+1}-1)(\sqrt{1-x}+1)=3x$
7, $(\sqrt{7+\sqrt{48}})^{x}+(\sqrt{7-\sqrt{48}})^{x}=14$