（12-（12*（3*sqrt3-1）/13）-2x）^2=0
    2.4y-9.8＝1.4y-9
    40x-5x^2=28.8
    x^2+2sqrt(5)x+2
    3000/10x+3000/12x=10
    3（x+100）/100+9x/250=36
    4278(13x+x²/2)-115329060=0
    （x+0.1）/120+x/100=36
    （x+100）/120+x/100=36
    4278(17x+x²/2)-115743540=0
    4278(92x+x²/2)-154601040=0
    5x-6=2+3(x+1)
    2^x^2=1/x
    -arctan(25x/(1+25x))=-arctan(250/251)+45
    arctan(25x/(1+25x))=arctan(250/251)-45
    0.45*xsqrt((1+100*25)/sqrt(1+25))=1
    arctan(25x/1+25x)-45=arctan(250/251)
    (22+40x)*40*(1+2x)=100
    x ²+x-8=0
    x^2=-1

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