solving linear equations

[pothuri]

hi..

i need help in solving these linear equations


ai*Xi-1 + bi*Xi + ci*Xi+1=d

where i =0 to n-1

as u can c there are n-1 equations but n+1 variables
the other two conditions are to be used which are

X0=0

and K<=Xi<=L

where ai, bi, ci, K and L are constants for each value of i.


any ideas for solving this.........

thnx