0.13271/x＝0.1289/0.86289
    0.4/100.58＝x/33.37
    x^2-590x-4000=0
    (16+x)/x=5
    16+x/x=5
    11200000=10000*（18000-x）-50000000
    1120=10000*（18000-x）-5000
    0=3x*x-15x-125
    （61919-1.1X）*10.4/22.4*0.9=8.8X
    x^2-126x+2205=0
    6x=9
    3x=9
    5x-10=0
    ex²sinx
    2*sprt((25*12)^2-120^2)/2
    (-2*(m+1))^2+12=0
    test AND 1=2
    test AND 1=1
    test
    387*x-x^2=29806

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