30.879ln(x) + 0.8492=84.1
    30.879ln(x) + 0.8492=50
    0.3x+1=10
    30%x+1=10
    0.3x+1=10
    30%x+1=10
    15=100×（x-216）/（x×190/100）
    （40.221+x）×1.95＝40.221+70.242-x
    （40.221+x）×1.75＝40.221+70.242-x
    （40.221+x）×1.55＝40.221+70.242-x
    （40.221+x）×1.35＝40.221+70.242-x
    （40.221+x）×1.15＝40.221+70.242-x
    （40.221+x）×1.15＝40.221+70.242+x
    300.5/29*x+116/29*(x+15)+87/29(x+30)=1023
    1-3-x/2=x-3/4
    -4x²-24x
    -4x²-24x
    0.8184*0.2^x=0.05
    0.8184*0.6^x=0.05
    2×x^2×e^2x+4×e^2x×x^3+4lnx-2=0

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