x^7-17*x^6+108*x^5-41*x^4+(68*9-64)*x^3-(58*9-62)*x^2+(22*9-15)*x-3*9=0
    （15234.375－S）×0.4033/1.06＝12187.5－S
    S－S*0.4033/1.06＝1662.62
    90x-9=88x-1
    90x-9=88+1
    n^3-6n^2+8n=0
    x^4-(8+5) x^3+(6*8+3) x^2-(9*8-5) x+3*8 = 0
    x^4-(6+5) x^3+(6*6+3) x^2-(9*6-5) x+3*6 = 0
    x^4-(5+5) x^3+(6*5+3) x^2-(9*5-5) x+3*5 = 0
    x+2=6×(x-4)
    ln（-2139x+7.4872）+2.2894＝17775×（0.00458-x）
    ln（-2139T+7.4872）+2.2894＝17775×（0.00458-1/T）
    （3/4）x+（12/77）x-2=0
    x^3+22x^2-275=0
    （1278+967x)*1.044=1033(1+x）+311
    （1278+967x)*1.055=1033(1+x）+311
    （1278+967x)*1.0578=1033(1+x）+311
    8x^2=12（2-x）^3
    x+6=x
    6.58=（（0.021*x^1.85+516）^0.5）*x^0.84

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