x(24-2x)=80
    x(24-2x)=72
    44=x/1814*100%
    320000000=0.5x*168+313x
    2x-2/4=8
    1280（1+x）^2=2880
    80.99*e(1.99/-2.24)-80.48*e(1.99/-1.95)-0.83
    3.47e(1.24/-2.32)-3.24e(1.24/-1.95)-0.02
    1.66e(x/-1.95)-1.5e(x/-2.32)=0
    √821750331/√7000000
    199.36e(1.06/-1.54)-190.74e(1.06/-0.88)-15.5
    2+4+6
    366.68÷x=99.32%
    4+56+7
    7x+x^2 = 50
    x2 - 17/3x -2
    4+5+6
    x(x-3)=180
    90÷5×15
    2x+8x=120

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