Mathematics
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    -(2/21)*(7/2)
    -(7/2)*(2/21)
    -(7/2)/(2/21)
    -7/2 / 2/21
    185×195÷25÷39
    -1089÷63×84÷121
    918÷85×(-125)÷270
    -84÷(-333)×(-888)÷56
    234×480÷(-208)÷108
    9.10-4.35
    283+(-149)
    -354+(-783)
    42×(-84)÷(-98)÷18
    (-143)÷169×39÷(-33)
    52×77-137×39
    (300-40-120)*3-280
    228×(-165)÷(-209)÷36
    -(-246)÷114×513÷369
    225÷375×(-1125)÷135
    -69÷(-84)×(-784)÷161

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