x*x=x*x-17x+60
    x^2-16*x+75=0
    (a-11.3)/(1+a)=7.3
    (a-4)/(1+a)=2
    （82661-1.5X）*8.4/19.4*0.9=18696+8X
    （82661-1.5X）*8.4/19.4*0.9=18696+7X
    （77011-1.5X）*8.4/19.4=18696+7X
    （77011-1.5X）*8.4/19.4=18696+8X
    （77011-1.5X）*8.4/19.4*0.9=18696+7X
    （77011-1.5X）*8.4/19.4*0.9=18696+8X
    0.02=Y*0.3333+（1-Y）*（-0.25）
    （0.5-0.3）X=5
    3.4751=log（3282.48*x÷（x－0.2849））
    23%=105%+r+105%r
    Y/194-Y/1000=234.32
    ln x ＝2x-2
    55.06+11.86y=33.05y+111.89
    1.6*(1+x)*(1+x)=2.5
    x-x/1.06*6.72%=4500000
    x-x/1.06*6.72%=79835.53

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