[tex]\displaystyle\\
\frac{a+2000}{2000}=\frac{b+2001}{2001}=\frac{c+2002}{2002}=k+1\\\\
a=k\times2000\\
b=k\times2001\\
c=k\times2002\\\\
a+b=2c-9\\\\
k\times2000+k\times2001=2\times k\times2002-9\\
k(2000+2001)=k\times2\times2002-9\\
4001k=4004k-9\\
4004k-4001k=9\\
3k=9\\\\
k=\frac{9}{3}\\\\
\boxed{k=3}\\\\
a=k\times2000=3\times2000=\boxed{\bf6000}\\
b= k\times2001=3\times2001=\boxed{\bf6003}\\
c=k\times2002=3\times2002=\boxed{\bf6006}
[/tex]