x²+x-2023
    7y^2+2y-1=0
    5*(1-x)^2=3.2
    400*(x^2)-800*x+39=0
    400*x^2-800*x+39=0
    400*x^2-800*x+39=0
    （10+x）（500-20x）=600
    200（1-x）^2=98
    200（1+x）^2=98
    5.027*0.0000001*x*x*x+2.436*0.001*x*x+12.24*x-33985.54=0
    0.5*（π*1.65*x*70)+0.7*0.8*2.14*[400+4*11.8*(x+4.68-3)=2272.82+16.05x
    5.027*0.000000001*x*x*x+2.436*0.0000001*x*x+12.24*x-33985.54*1000=0
    5.027*0.000000001*x*x*x+2.436*0.0000001*x*x+12.24*x-33985.54=0
    5.027*1000000000*x*x*x+2.436*10000000*x*x+12.24*x-33985.54=0
    5.027*1000000000*x*x*x+2.436*10000000*x*x+12.24*x-33985.54*1000=0
    5.027*1000000000*x*x*x+2.436*10000000*x*x+12.24*x-33985.54*1000=0
    5.027*1000000000*x*x*x+2.436*10000000*x*x+12.24*x-33985.54=0
    0.5x=2/3x^2
    x^3-18x^2+54x-54=0
    sinx(cosx*sqrt(3)/2+sinx/2)=3/2

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