x^3+1.1x^2+0.9x-1.4=0
    (X-180)*(1-25%)/1500=(X-180-320)*(1-25%)/1000
    (X-200-150)*(1-25%)/3300=(X-200)*(1-25%)/3000
    x^9=3^x
    2m*m-3*m-54=0
    2m*m-9*m+14=0
    -m-sqrt(m*m-20)=2*abs(-m-sqrt(m*m+20))-6
    -m+sqrt(m*m-20)=2*abs(-m-sqrt(m*m-20))-6
    X-X／1.13×0.13=28037383.18
    (x-6000*0.08-400)*(1-0.25)-3000*0.1/5000=(x-3000*0.08-400)*(1-0.25)-3000*0.1/6000
     x－x－53＝1
    x+x/11.3=105000
    x+2x^2*sin（1/x）
    400*64.3-400x=150*165.3-150x
    (16*x/3)-x^(2)=2^(x)-1
    x^2-36x=100
    x2-36x=100
    x/(x+1079055)=0.3054
    x^3+x^2=3600
    （10+x）（200-10x）

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