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    -12500-(5000+a)×12%÷12+a=5000
    -12500-(5000+a)*12%/12+a=5000
    10000(1+x)^2=106609
    40+10x^2+39x=0
    0.9958=2.43x/(1+1.43x)
    13x^2-12x-28
    (3x^2+16x-64-76)/(x+10)
    (3x^2+16x-64-76)/(x+10)
    x-22=0.05x
    20.8×a×0.6=6.9
    12×a×0.6=3
    (r-7)^2+18.5^2=r^2
    300-4x=250
    arctan2x-arctan0.5x-arctan0.2x=0
    x+(1-x)x+(1-x-(1-x)x)x=0.6
    x^2-6x+8=0
     x^2+4×x=3.75
    49*x^2=25*(x+50/7)^2
    3/5-1/5x=1/10
    1-4^(x+1)=2^x

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