x*14.3*502654.82*(1-sin(2*3.14*x)/(2*3.14*x))+(3*x-1.25)*360*2513=0
    x*14.3*502654.82*(1-sin(2*3.14*x)/(2*3.14*x))+(3*x-1.25)*360*3927=0
    160-x×(x+12)-(x+12)×(x+12)=0
    1.6(1+x)=2.5
    0＝60％－15％－（1＋x）/x×5％×100％
    2xx+3x=65
    xxxx-40xxx/3+391xx/9+74x/3-308=0
    ln（x）=-5.88
    2x-2=6
    2x-2=6
    2x-2=6
    2x/3=6
    2x/3=6
    （300-3）×x＝280+150×x
    cotπ/4
    x∧6＋51×x∧5＋741.947×x∧4＋1896.637×x∧3＋2092.304×x∧2＋1096.49×x＋217.625=0
    x²+9x+4-sqrt2=0
    x^2+9x+4-sqrt2=0
    (199+x)/(258+x)=0.8
    0.2*（1+x）^10 = 0.532

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