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(1/5+2/3)*(1/7+4/5) = 0
(2/3+1/5)*(1/7+4/5) = 0
(1/5+2/3)*(1/7+4/5) = 0
13/15*(1/7+4/5) = 0
13/15*(4/5+1/7) = 0
13/15*(1/7+4/5) = 0
13/15*33/35 = 0
143/175 = 0
L <> R
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