W=B (L1-L2) / 6 solve for L2

Solve for L2:

W = 1/6 B (L1 - L2)

W = 1/6 B (L1 - L2) is equivalent to 1/6 B (L1 - L2) = W:

1/6 B (L1 - L2) = W

Divide both sides by B/6:

L1 - L2 = (6 W) / B

Subtract L1 from both sides:

-L2 = (6 W) / B - L1

Multiply both sides by - 1:

Answer: L2 = L1 - (6 W) / B