Mathematics
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    15+28/7
    (72-18)/9
    20+48/6
    (4+5)*7
    24/3-2
    (30-22)*7
    4*(16-9)
    (11-8)*8
    50- (30+10)
    7+36/6
    5*9-41
    81-5*2
    61-9*3
    9*4/6
    25/5*8
    60-12/6
    6*7+3
    7+6*4
    7/7*3
    28/4*6

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