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    (12+8)-3
    17
    (30-10)-7
    13
    (40-20)+9
    29
    20+(70-60)
    30
    50+(20-20)
    50
    (17+3)-11
    9
    (90+10)-40
    60
    80+(0+10)
    90
    20+(40-30)
    30
    20+(80-60)
    40