x^2+4x+17=0
    x+88=733
    x-(x*0.1%)=5000
    x-(x-x*0.1%)=5000
    x（29/2-2x）=（2X-4）（22/5-X）
    x（5.8-2x）=（2X-4）（4.4-X）
    x² - (6 - x)²+4
    25.09×6.24+13.08c=（25.09+c）×7.925
    25.09×6.24+13.08c=（25.09+c）×7.92
    25×6.24+13.08c=（25+c）×7.92
    13.07c=（3.3+c）×7.90
    13.07c=（3.3+c）×7.92
    24X÷2=180
    (130-x)+(80-x)+X=180
    tanx＝2x
    1342*X+37120=2431.27X
    -235+225/(1+x)^(3/12)+25/(1+x)^(5/12)=0
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=3500
    x(8-x)=79
    2/x-㏑x-1

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