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4*(2-5)+3*9+(4+20)/4-2 = 0
3*9-3*4+(4+20)/4-2 = 0
3*9+(4+20)/4-12-2 = 0
(4+20)/4-12-2+27 = 0
(4+20)/4-2+15 = 0
24/4-2+15 = 0
6-2+15 = 0
21-2 = 0
19 = 0
L <> R
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