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    49x^2-1260x+8100=0
    ln(1+x)-x/2=-0.577
    10x+9-x-90+10x+x=9
    2x-12=0.5x+15
    (240-150)x=150*12
    240x=150(x+12)
    ln(x/126)=-1.24
    X-20%X=11.99
    1/x=0
    X-20%=11.99
    g
    x×x+x=240
    √64-x²+√36+x²=10
    ln(1+x)-x/2=-0.577
    x^3-60x^2-8300x+432000=0
    0.91*0.81*2.76*x=4.05
    1.21*0.79*2.29*x=4.2
    X^2/(1-2x+x^2)=1.43
    X^2/(5-6x+x^2)=1.43
    x^4+x^2+1=0

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