ln9
    2x+5=0
    3^(x-2)+3^(x-1)+3^x=|1701|
    log(5,x^3)=15
    log(5,x)=15
    log(5,x^4)=15
    log(5,x^4)=30
    13.75-13.75x=8.3
    3.75-13.75x=8.3
    7x^2 + 40x − 12 = 0;
    5700=1.36x+89
    95=1.36x+89
    17一2x=7
    30-2x×20-2x=264
    Y-Y/1.03×3％×1.1=1000000
    Y-Y/1.03×3％×1.1=1000000
    (119x^2)+676x+426 = 0
    8*24*4+5*13*4+1500
    8*24+5*13+1500
    （（1.12^10.5）-1）/（0.12*（1.12^10.5））

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