X+400-3/100*(20000+X/0.13)=1800
    -1200+（40*(1-X)*10-170）*5.6502+100*0.322=0
    x^3+5x-3= 0
    x^3+5x+6= 0
    x^3-5x+6= 0
    x^3-4x-6= 0
    x^3-4x-5= 0
    x^3-4x-1= 0
    x^3-6x-7= 0
    x^3-6x-5= 0
    x^3-6x-1= 0
    x^3-6x-5= 0
    x^3-5x-5= 0
    x^3-5x-4= 0
    x^3-5x-3= 0
    x^3-5x-2= 0
    x^3-5x-1= 0
    x^3-5x+3 = 0
    x^3-5x-3 = 0
    x^3-4x-5= 0

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