80x-x²=750
    ln(x)*e^x=1
    7200/1.2x=4500/x+10
    50701.38-X*0.0003+(X+X*0.0003)*0.25 = X
    701.38-X*0.0003+(X+X*0.0003)*0.25 = X
    x^2+0.1x-0.001=0
    X-X*0.03=30000
    2.9/7.1×30/X=0.04
    6.9×1.04^X=10
    -2x²+200x-3200=0
    -2x²+200x-3200x=0
    1/2x²+2x-5/2=0
    m（200-m）=9600
    200m-m 2
    X+X÷21.75÷8×2×8×4+X÷21.75÷8×2×3×21=5000
    X+X÷21.75÷8×8×4=5000
    81x+9=3.6
    6.38*1.04^x=10
    6.38*1.04^x=1.567
    1.04^x=1.567

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