2*s^3+12*s^2+18*s+6=0
    2*s^3+13*s^2+18*s+6=0
    -2x²+2x+1
    1280=2x+1039+2496/4x
    1280=2x+1039+2496^4x
    1280=2x+1039+2496*4x
    1280=2x+1039+6231
    cos(4*x)+(sin(3*x))^2=1
    1/x+1/(x+1)+1/(x+2)=1/(x+3)
    4*x^3+18*x^2+22*x+6=0
    1280=2x+909+76336
    76336*4x
    1280=2x
    79302x+86159440＝16.1×1500×0.9×126.46×(0.9x-0.45×126.46)
    129360x+1193430000＝16.1×1600×0.9×138.75×(0.9x-0.45×138.75)
    x+（x/22.5）=4257
    x+（x/22.5）=10
    15/(10000+y)=6/y
    x+35+x×1.35%+38×1.08=5134.03
    x+35+x×1.35%+38×1.08=5134.03

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