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    x-{(x-5000*9)*10-2520}=148500
    50000=30000(1+x)^4
    2x^2+7x-4=0
    Y=100+0.9Y+50
    100+0.9Y+50
    5.635*t^2-23.46*(t-10)^2=708.43
    75×7.80+13.07x=(75+x)×7.97
    75×7.80+13.07x=(75+x)×7.98
    (x-1.322)*100-0.2=0.8
    (26.813+x)×2.95=53.627+72.74-x
    (26.813+x)×2.95=53.627+73.24-x
    (x*6-20)/6=29.8
    750÷(1+x)-30x
    750x÷(1+x)-30x
    0.3/0.2588=xe^(-x/2)
    750÷1+x-30x
    0.2/0.2588=xe^(-x/2)
    0.1/0.2588=xe^(-x/2)
    0.7/0.5=xe^(-x/2)
    0.6/0.5=xe^(-x/2)

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