500*x*（1-5%）-500*30-27500=500*x*10%
    (201.746792+a)*1.59*2=(498.561088+a)*2.15
    (160+a)*1.59*2=(498+a)*2.15
    (150+A)*1.59*2=(355+A)*2.03
    X*0.03=X-25
    X*0.03=X-125
    X*0.03=X-75
    X*0.03=X-75
    X*0.03=X-75
    X*0.03=X-75
    X*0.03=X-75
    X*0.03=X-75
    X*0.03=X-75
    X*0.03=X-75
    X*0.03=X-425
    X*0.03=X-1877.67
    sqrt(3)/8*x^2+sqrt(126)/4*x-sqrt（48）=0
    sqrt(3)/8*x^2+sqrt(126)/4*x-sqrt（48）=0
    sqrt(3)/8*x^2+sqrt(126)/4*x-sqrt（48）=0
    sqrt(3)/8*x^2+sqrt(126)/4*x-sqrt（48）=0

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