2(4x-3)-5=2(x-1)-1/2(x+1)
    3(x-3)=5-2(2-5x)
    2^x/1
    (X+1)^2+(4x)^2=(4x+1)^2
    x^5+10*x^3+20*x^2-4=0
    x^5+10*x^3+20*x^2-4=0
    x*x=90
    x^x^x=3
    x*3.14=6.28
    x-x*0.05=800
    tan（x）-x＝0.014904
    tan（x）-x＝0.014904
    1/(x^(1/2))=-2*log(2.51/(146204*(x^(1/2)))+0.0001/0.371)
    1/x^(1/2)=-2*log(2.51/(146204*x^(1/2))+0.0001/0.371)
    tanx-x＝0.014904
    tanx-x＝0.019402
    x^2
    32x^3(x+sqrt(3))=(19x^4+6x^2+3)(1-sqrt(3)x)
    [(5-y)/2019]-5=2019(5-y)-(-8226084385/2019)
    a×0.6×0.6=2.9

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