3x+5x=96
    14-2x-2＝2
    91-x＝50
    100x-270=90x+450
    9-x＝5
    100x+270=90x+450
    x/45+6%=x+5/50
    （√9+16）-6lne^(3)+tan(π/4)-lg100
    x^3+12*x^2+25x+50=0
    x^3+12*x^2+25x+50=0
    31.1-x=0.163x
    x-31.1=0.163x
    x+31.1=0.163x
    （7-x）/0.00129=8251*x^0.75
    (15.72*23.58+20.58*18.72+14.6*18.54+16.48*17.77+17.98*17.29+9.54*18.8+5.10*x)/100=19.06
    (15.72*23.58+20.58*18.72+14.6*18.54+16.48*17.77+17.98*17.29+9.54*x)/94.9=19.07
    (15.72*23.58+20.58*18.72+14.6*18.54+16.48*17.77+17.98*x)/85.36=19.10
    5*1/(1+r)+5*1/(1+r)*1/(1+r)+5*1/(1+r)*1/(1+r)*1/(1+r)+5*1/(1+r)*1/(1+r)*1/(1+r)*1/(1+r)=102.78
    5*（1+r）-1
    -2xxx-30xx-300x+2000

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