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
    M*1/3/3100+M*0.8/3/1000+M*1.2/3/2200=1
    x^3-2.05x^2+0.0016x+0.1556=0
    x^3-2.05x^2+0.0016x+0.1756=0
    x^3-1.97x^2+0.0016x+0.1756=0
    (151+218.5)/31*x+279/31*(x+15)+124/31(x+30)=2670
    9x-1=0
    x÷3-x÷8+273+50+130＝x÷2
    x÷3-x÷8+273+50+80＝x÷2
    x÷3-x÷8+273+50＝x÷2
    sqrt-1=x
     x^2-2x+1 =99
     x^2-2x+1 = 09
    x^8-23x^3+55x^2-2929=-7x^7
     x^2-2x+1 = （x-1）^2
    x^2-2x+1=（x+1）^2

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