13.8+x*4.3=18.3+x*3.3
    13.8+x*4.3=18.3+x*3.3
    x-x/1.06*0.06-x*0.1=13176.51
    x*2.3*1.05=2.44
    1+x=3
    x=44+x/1.17*0.17+0.15x
    (x+1000)-5%×(x+1000)-473.09=3872.25
    (x+400)-5%×(x+400)-473.09=2685.66
    x-0.5x-473.09=2685.66
    x+400-0.5x-473.09=2685.66
    x+x*0.01=1972.5
    0.1256+0.448*x-0.567*x*x=0.2424
    x^2-16x-64 = 0
    x^2-16x-34=0
    2400-（40-2a）（60-2a）=900
    ln(x/2) = (1/100)-(1/50x)
    ln(x/2)=(1/1000)-(1/500x)
    ln(x/2)=5
    10x²-60x+8000=750
    1.5-3y=5

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