30000（10+m）+（18000+1000m）（15-m/5）=558000
    0.55x+0.15x+0.25x+0.043x+0.12x-0.125x=10
    e^x+1=x*e^x
    x*x-4.8x-6.56=0
    x(e^x-3)+3=0
    0.09*x=90*0.91
    1.5/28000=1.41/(14100+x)
    （5070000+（45.5*45.5*364/x^2））*（x-45.5*0.00004267）=45.5*8.134*373.15
    5x²+20x+20=0
    10x(x-3)=[10x+(x-3)]2/7
    4*x*x*x+15*x*x+16*x+6=0
    x^3+3x^2+6x+2=0
    7*(x-5)=(x-5)^2
    lg(24/168)*(0.05296+x-50)=0.07804*(x-50)
    2420＋X＝2X
    sin2x+cosx
    100*（1+x）^5=180
    36÷X×3＝4
    36/X＝9
    x*0.3=123

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