9-（4-x)=2
    （（1+i）^5-1）/（i*（1+i）^5）=2
    X^3+8x^2-21x-18=0
    7.56+X+(（x/2/12）+0.63)*26%*12=21
    x/lnx
    2*x*4x/(x+4x)=480
    2*x*4x/x+4x=480
    7.56+X+(（x/2/12）+0.63)*36.5%*12 = 21
    (2×x×4x)/(x+4x)
    2*X+X*0.7=34.425
    5(6-0.4t)=-(1.8t+4)
    2/480=1/X+1/4X
    7.56+X+(（x/2/12）+0.63)*50.7%*12=21
    sqrt(1-x^2)
    0.004x^4+0.46x^2+431.6
    0.92*1*x*3=3.56
    10*sinx+x*cosx+x=0
    tan(π/8＋x/2)=-1/2 tan2
    tan(π/8＋x/2)=-1/2 tan2x
    x^3-20x^2-16025x+806250 = 0

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