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    (x-43.8)/43.8+x*0.13+(x-43.8)*0.05=0.09
    ex*(x+1)=1
    (140-100-a)(300-2a)=1200
    (x-43.8)/43.8=0.09
    (x-43.8)/43.8=0.09
    (120-80)×400+(500-400)×(120-X-80)=500×80×45%
    (120-80)×400+(500-400)×(100-X-80)=500×80×45%
    (120-80)×400+(500-400)×(100-X-80)=500×80×45%
    x^3-3x+1=0
    (140-100-a)(300-2a)=1200
    (120-80)×400+(500-400)×(100-X-80)=500×80×45%
    4x+5(30-x)
    (80-x)*(200+10x)=9000
    20x^2+20x-4.8=0
    sinx=1
    sinx=1
    sinx=1
    6.6x-4.6x=3.2
    0.75^x=1/12
    x^2+2sqrt(20)x-80=0

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