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    (x-4)/76%+4=x/7/9
    76%x+4=(x+4)*7/9
    76x=10
    logx=0.816
    logx=0.764
    logx=0.577
    logx=0.2778
    (1/3+7/20)X=820
    (1/3+7/20)=820X
    820X=(1/3+7/20)
    X=820÷(1/3+7/20)
    2.1=x*0.0869+x
    0.07×10000 = 25.3x+x²
    52.92×10000=25.3x+x²
    0.01=2.4×(1.1-x)×(1.1-x)×(1.1-x)
    x²+1.36x-0.882=0
    x²+0.73x-0.441=0
    (x×2×0.75)÷2 = 38
    x×2×1.75 = 38
    x×2×1.25 = 38

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