x^7-2x^6-7x^5+10x^4+3x^3-10x^2-x+1=0
    x^7-2x^6-7x^5+10x^4+3x^3-10x^2-1x+1 = 0
    3*x^x-4*x=12
    x^5-15x^4+85x^3-225x^2+274x-120=0
    （x^2×1.2+10）×（x^2×2600+2）＝240
    84.3 = 34.765ln(x) - 5.4445
    50 = 34.765ln(x) - 5.4445
    84.1 = 34.665ln(x) - 6.077
    50 = 34.665ln(x) - 6.077
    84.1 = 34.521ln(x) - 3.4132
    50 = 34.521ln(x) - 3.4132
    84.1 = 33.96ln(x) - 7.0756
    50 = 33.96ln(x) - 7.0756
    （440*34-x）*0.9+8*34=11428.08
    x+√(x+0.7)-√0.7=1.5
    84.1 = 35.395ln(x) - 7.3177
    50 = 35.395ln(x) - 7.3177
    23317.45=（480*63-x）*0.85
    610/1235=360X/[360*(X+0.10)]
    (100-x)*(60-2*x)=4750

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