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la-bl = 18
lc-dl = 8
lb-dl = ?

1) lc-al = lc-bl
a-b = -18 , a-b = 18
c-d = -8 , c-d = 8
Insufficient.

2) a is to the left of d
We dont know if a is positive or negative. Insufficient.

(1) & (2) together
We still dont know if a is positive or negative. We still cannot determine the exact value of a, b or c. Insufficient.

Thus, E is the answer.

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