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
    （27.776+x）×0.85＝55.552+75.128-x
    （27.776+x）×0.85＝55.552+76.128-x
    （27.776+x）×0.85＝55.552+77.128-x
    （27.776+x）×0.85＝55.552+78.128-x
    -x^2+4x+3=0
    x∧4+2X∧2-24=0
    x4+2x2-24=0
    -x^2+7/3x+2=0
    2500＝1.1*222.4arctan(x^2/15.8/sqrt(62.5-x^2))
    2500＝1.1*222.4arctan(x/15.8/sqrt(62.5-x))
    1604*（1+x）^5=2933
    x-75%x=1/2
    x-75%=1/2
    10t²+10t -15=0

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