10/12÷2/5
    1/2÷1/12
    6/8÷5/7
    4/6÷3/4
    2/8÷2/8
    2/18÷2/18
    5/10÷6/12
    7/12÷1/2
    2/9÷4/6
    5/6×3/5
    1/3×7/12
    3/1×12/7
    1/2+1/3
    40/63+2/9
    7/9-1/7
    4x/200=5x/200+0.5
    10000000000*2/999999999999999999999999999999999999
    2/3 2/4 2/5
    2/3
    1-x/3-3=3-x+2/4

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