x=84892.5+(x*1.33%)
    s(0.5s+1)(0.1s+1)=20
    3*x^4+24*x^3+54*x^2+48*x=0
    19855*(0.0243+23.82*x)*(0.98785-11.91*x)=1165
    x^2*(x+4)*(x+6)=(4*x^3+30x^2+48x)*(x+1)
    1+2a
    x^3+8x^2+18x+16=0
    x
    10=27.4*x^2.996+1.294*x^1.498-29.89
    x*(76-0.5*x)=345.8256
    20/(x*(1+(0.25*x)^2))=0.4877325886
    20*((1+(x/4.4)^2)^0.5)=x*((1+(x/2)^2)^0.5)*((1+(x/17.6)^2)^0.5)
    (1/x)*ln(1-x)=-1.064
    (1/x)*ln(1-x)=1.064
    (1/x)*ln(1-x)=0.064
    （X-767.55-5000）*0.03=X-6000-767.55
    (1+x)^1/2
    （1+xx^1/2=0.014
    (5.3x-5)/7=x-8
    y=100+0.8（y-100+50）+200+100

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