3x^2+10x-65=0
    x^2+10x-65=0
    x^2=0.00003375*（0.1-x）
    2/(x-2)+2
    （5.8-5.8/1.13*0.13+0.13）/6.86=X
    （7-7/1.13*0.13+0.15）/6.86=X
    1/101*X+13/113*(30383.73-X）=1939.26
    1/101*X+13/113*(23135.14-X）=1939.26
    1/101*X+13/113*(23135.14-X）=2685.13
    1/101*X+13/113*（293786.95-X）=18766.32
    -(1/14y)=-(124/21)
    -14y=-(124/21)
    x-（x*25%）=2504.4
    x-（x*25%）=2556
    301870.91-120000-X=（25984.14-X/1.01*0.01-3495.15)*1.12
    301870.91-X=（25984.14-X/1.01*0.01)*1.12
    x*0.5=x-2
    arctan((tanx)²)
    x*2=x-2
    （27.776+x）×0.85＝55.552+74.128-x

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