-21*x^3 + 5*x^2 + 8*x + 38
    x＾4-12x＾3+46x＾2-66x+28=0
    x＾4-11x＾3+40x＾2-56x+24=0
    x＾4-10x＾3+34x＾2-46x+20=0
    x＾4-9x＾3+28x＾2-36x+16=0
    -x＾3+12x＾2-48x+64=0
    x＾3-15x＾2+70x-104=0
    45200*188*50*700+206000*188/y*(y-35)*1130.4+206000*188/y*(y-115)+206000*188/y*(y-150)*180*(y-150)=206000*188/y*(12+150-y)*(150+12-y)+206000*1800/y*(534-y)*22*180
    45200*188*150*700+206000*188/y*(y-35)*1130.4+206000*188/y*(y-115)+206000*188/y*(y-150)*180*(y-150)=206000*188/y*(12+150-y)*(150+12-y)+206000*1800/y*(534-y)*22*180
    6x＾2-54x+86=0
    x＾4-(7+5)x＾3+((5+2)7-2＾2-3*2+7)x＾2-((7+2*2)7-2*2＾2-6*2+3)x+3*7=0
    x＾4-(12+5)x＾3+((5+4)12-4＾2-3*4+7)x＾2-((7+2*4)12-2*4＾2-6*4+3)x+3*12=0
    x＾4-(11+5)x＾3+((5+4)11-4＾2-3*4+7)x＾2-((7+2*4)11-2*4＾2-6*4+3)x+3*11=0
    x＾4-(14+5)x＾3+((5+3)14-3＾2-3*3+7)x＾2-((7+2*3)14-2*3＾2-6*3+3)x+3*14=0
    x＾4-(13+5)x＾3+((5+3)13-3＾2-3*3+7)x＾2-((7+2*3)13-2*3＾2-6*3+3)x+3*13=0
    x＾4-(12+5)x＾3+((5+3)12-3＾2-3*3+7)x＾2-((7+2*3)12-2*3＾2-6*3+3)x+3*12=0
    x＾4-(11+5)x＾3+((5+3)11-3＾2-3*3+7)x＾2-((7+2*3)11-2*3＾2-6*3+3)x+3*11=0
    x＾4-(10+5)x＾3+((5+3)10-3＾2-3*3+7)x＾2-((7+2*3)10-2*3＾2-6*3+3)x+3*10=0
    x＾4-(9+5)x＾3+((5+3)9-3＾2-3*3+7)x＾2-((7+2*3)9-2*3＾2-6*3+3)x+3*9=0
    x＾4-(8+5)x＾3+((5+3)8-3＾2-3*3+7)x＾2-((7+2*3)8-2*3＾2-6*3+3)x+3*8=0

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