8x/0.4=2.5
    12/7-x=0
    (x-4)^(1/3)
    x^2=1+2x
    sin（2/n）=0.008489n
    x^2-7.5x+8.5=0
    x^2-7.5+8.5=0
    3.5x+5.5（4217-x）=22065.5
    x+2/3=2/3x
    x^2+2*x=20
    20-4*x=20-2*x-x^2
    (12*sqrt(2)-2*x)*x=32
    x*99.975%-125.570*100.025%=2/10
    x*99.975%-125.570*100.025%=1/10
    x*99.975%-125.624*100.025%=2/10
    x*99.975%-125.624*100.025%=1/10
    -x4-6x3-13x2-12x-2=0
    2x+x^2=20
    2x+x^2=30
    1.175=（（0.021*x^1.85+398）^0.5）*x^0.84

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