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(-1/6)*(16-12)+(1/3)*(3+16) = 16-12
(1/3)*(3+16)-1/6*(16-12) = 4
(1/3)*(3+16)-1/6*4 = 4
(1/3)*(3+16)-2/3 = 4
1/3*(3+16)-2/3 = 4
1/3*19-2/3 = 4
19/3-2/3 = 4
17/3 = 4
L <> R
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