linear Diophantine Equation

Hey all,


I just started to use PARI/GP and managed to get along quite well so far 
(thanks to the helpful ref-Cards), but now I came to a point, where I 
need to solve a linear Diophantine equation of the form

a_1x_1+ a_2x_2 +a_3x_3+ ...+a_kx_k = c


and I wonder, how to best approach this. I appreciate any help!

Thanks in advance,

Anneke