Mathematics
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    x-5000=5000×3.5%
    8x-60-4x=72
    1623747600+(-1883401087)=
    (x/2)0.2(x/2-1)=9
    (20/x)-1=(2/x)^0.2((2/x)-1)
    20/x-1=(2/x)^0.2(2/x-1)
    2.6*100000*Q*Q+2.4*100000*Q*Q=20.9
    45(3x-6)+25(3x-8)=
    1/2x-2+x=118
     (X-X^2-X^2)*X/2 = 80
    (X-X^2-X^2)*X/2=80
    (X-X^2-X^2)*X/2=20
    (2+x^2+2+x^2+3)*x/2=15
    1215294-0.06X=X
    0.2×10.84^0.2
    2^1.2
    4.94^0.2
    -5x^2+80x+400
    -5(x^2-16x)+400
    (4+0.4n)*(20-n)

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