Is each one repersentative of a DIFFERENT value? In other words, if k = a, does this hurt our feelings?
Let's assume that it would be bad and each letter is a distinct value.
k + k + l = e OR k + k + l = e + 10 OR e + 20 -- These are the only possibilities.
Moving on: If it is just e, then l + l + l = 2l = s OR s + 10 OR s + 20.
What did you try and where did it lead you?