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15-(((7-9)/6)*(9-2)) = 3/5
15-((-2/6)*(9-2)) = 3/5
15-(-1/3*(9-2)) = 3/5
15-(-1/3*7) = 3/5
7/3+15 = 3/5
52/3 = 3/5
L <> R
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