xtan(0.5x)=2.83
    xtanx=2.83
    (2x+1)e^x
    x×x+280x-2520=0
    （e^x+1）^2
    80- x➗3=76
    80-x➗3
    9[x^2+(x-3)^2+(x-1)^2]=x^2+10(x-3)+100(x-1)-20
    0.1-x/x-3x^2=2.14*10^18
    2(x² + 6x + 1)² +5(x² + 1)(x² +6x +1)+2(x² +1)²
    120-0.5x=52
    3d^4+15d^3+96.5d^2+120d+25=0
    x^1.5
    4*（7+x）/6=2*8+5-x
    -0.1x^2+218x-12198.1675=0
    -0.1x^2+218x-12198.1675=0
    -0.1x^2+218x-12198.1675=0
    -0.1x^2+218x-12198.1675=0
    -0.1x^2+218x-12198.1675=0
    -0.1x^2+218x-12198.1675=0

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