giải các phương trình sau :

a. \(\frac{x+1}{35}\)+\(\frac{x+3}{33}\)=\(\frac{x+5}{33}\)+\(\frac{x+7}{29}\)

b. \(\frac{x-10}{1994}\)+\(\frac{x-8}{1996}\)+\(\frac{x-6}{1998}+\frac{x-4}{2000}+\frac{x-2}{2002}\)=\(\frac{x-2002}{2}+\frac{x-2000}{4}+\frac{x-1998}{6}+\frac{x-1996}{8}+\frac{x-1994}{10}\)