Tìm x biết:
1) \(8^{x+3}+2^{3x}-3.2^{x+4}.4^{x+1}=321\)
2) \(\left|x+1\right|+2.\left|x-2\right|=6\)
3) \(\left|3-2x\right|=x+1\)
4) \(\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2016}\right).x=\frac{2013}{1}+\frac{2012}{2}+...+\frac{2}{2012}+\frac{1}{2013}\)