arctanx+arctan10x=π/4
    （21/4）x^（0.75）-2x＋1=0
    x^（0.25）=（63/32）
    2*3.14*(3*0.0617+1)*x-sin(2*3.14*x)-2.5*0.0617*3.14
    -x(x-3)＝1
    ㏑(75-x)e^x=107.19
    a^2-118a+3200
    200 x^2-210 x+27=0
    -(-(1/2)X+7/3)^2+2(-(1/2)X+7/3)+3=X+1/3
    XX+X+8=0
    X2+X+8=0
    X2+X+8=0
    x^3-60x^2+1075x-5250=0
    x^2+x=96
    x^2+x=96
    x^2+x=90
    x^2+x=98
    x^2+x=96
    2x-10-25/x^2
    6751*x∧4-268.44*x∧3+34.645*x∧2+0.6596*x-0.0639＝0

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