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    2430/(10×x%)-3240/(15×x%)=30
    2430/10×x%-3240/15×x%=30
    4x^2/2x^2+2=6/4
    e^x+3*x
    e^x+3x
    e^x-x^2
    500:17500=15:x
    17500:500=x:15
    17500:500=15:x
    17500:15=x:500
    12:8=x:2
    8:x=12:2
    12x=16
    X+(X-7.81%)*1.025=21%
    25+x=33.44+148.738-x
    -150+90/(1+R)+95/(1+R)^2+85/(1+R)^3+85/(1+R)^4-240/(1+R)^5=0
    10lgX=8
    10lgX=6
    10lgX=6
    10lgX=6

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