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(-1/6)*(18-12)+(1/3)*(3+18) = 18-12
(1/3)*(3+18)-1/6*(18-12) = 6
(1/3)*(3+18)-1/6*6 = 6
(1/3)*(3+18)-1 = 6
1/3*(3+18)-1 = 6
1/3*21-1 = 6
7-1 = 6
6 = 6
L = P
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