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84-((7*(25-(3*(3-7+9))))/14) = 0
84-((7*(25-(3*(9-4))))/14) = 0
84-((7*(25-(3*5)))/14) = 0
84-((7*(25-15))/14) = 0
84-((7*10)/14) = 0
84-(70/14) = 0
84-5 = 0
79 = 0
L <> R
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