x^3+3x^2+2x+1=0
    15=100×（X-216）/（X×160/100）
    K=283+5.7+1.2+14.5+0.0536K
    K=293+5.86+1.27+15+0.0536K
    (220*2*55-x)*0.9+18*55=19738.4
    5-x=3
    x^3+5x^2+25=0
    ln(x+(x^2+1)^(1/2)=5
    0=49a+9
    0=49a+9
    X（36−2X）=168
    X（36−2X）=168
    x/2-4=2x+3-5x/2
    2/x-4=2x+3-5x/2
    3/2*（2/3*（2x-1)-2）-x=2
    3x^3+16x^2+26x+16=0
    3x^4+16x^3+26x^2+16x=0
    (1/20-x)*(1/20-3*x)^3-10^(-34)=0
    x^3+6x^2+18x+20=0
    2x^2-6x-36=0

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