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3*(800/8)-((6*20)/2)-20+25 = 0
3*100-((6*20)/2)-20+25 = 0
25-((6*20)/2)-20+300 = 0
25-(120/2)-20+300 = 0
25-60-20+300 = 0
25-20+240 = 0
25+220 = 0
245 = 0
L <> R
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