This cache is a twist on the classic Sudoku, and is called a Sumdoku.
The rules of the Sudoku all apply here. Each row, column, and nine-block bolded section each must contain the numbers 1 through 9. The sumdoku has fewer starting numbers, but has additional rules that allow you to figure things out. Each dotted line section lets you know the sum of all the numbers within that section.
This particular Sumdoku is a rather easy one, with easy starting points. Others are not so forgiving!
Once you complete the Sumdoku you will have the values for A-F which you can use to get the final coordinates below.
N 40 35.GHI W 75 29.JKL
G = D * E / C
H = F * C - A
I = E * B * E
J = A + B + E
K = (D + C) / F
L = A / F + C
