100-X*X=16
    (2-X)(2-X)=1
    (2-X)(2+X)=1
    x^6-6x^5-15x^4-20x^3-15x^2-6x-1=0
    （60a-2191.36-（60a*13%-170）*12%）*75%=131.24
    x+1/x
    π*(D^2-74^2)=2000000*4*0.042
    x*99.975%-109.971*100.025%=1/10
    1^x=4
    x^2-16.2x+64.6=0
    0.28=X*200000/5336284
    x^2+7/2X=2
    4sqrt((15x)^2+1)=x*sqrt(4x^2+1)*sqrt((166x)^2+1)
    5=0.094*x*0.32
    4sqrt((76x)^2+1)=x*sqrt(4x^2+1)*sqrt((81x)^2+1)
    5=0.65*0.094*x
    4x=0.32*sqrt(4*0.32^2+1)
    90-arctan(2x)=56.9
    4*sqrt((7.7x)^2+1)=x*sqrt(4*x^2+1)*sqrt((29x)^2+1)
    4*x=0.65*sqrt(4*0.65^2+1)

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