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40*(5/6)-(40*(1/5))+4 = 40*(7/10)
5/6*40-(40*(1/5))+4 = 7/10*40
4-(40*(1/5))+100/3 = 28
4-(1/5*40)+100/3 = 28
4-8+100/3 = 28
4+76/3 = 28
88/3 = 28
L <> R
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