80x+1080=100(x-4)
    ln（10.232/6.220）＝（x/8.314）*（1/298.15-1/308.15）
    1.6 ×0.85× X=3.37
    12586.15=(220*63-X)*0.95+32*63
    12586.15=（220+63-x）*0.95+32*63
    X^3+X-1=0
    x=600/400*0.01*0.99+0.01*ln(0.01)+0.99*ln(0.99)
    7500X+3363.5-70605.24-((7500X+3363.5)/(1+9%)*3%*1.1+1000.46)-((7500X-7500X/(1+9%)*3%)*1.5%)=0
    -1200/273+1/x+1/(1-x)=0
    2.198*(1-2*x)+ln(x)-ln(1-x)=0
    tanx-x=π÷60
    33x-2x^2=54
    -4114150+3000000-450000+x-x*10%/4 = 300000
    x²=3[x]
    x+5x/10=6000
    2.5（1-2/（x+1））^2=1.5
    2.5（1-2/（x+1））^2=1
    t^3-21*t+20=0
    X-54=0.3571X
    X-54=0.7576X

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