2*arctan2x+arctanx=180
    (-1)a-(a+1)×(-1)-4=5
    3/4x+6＝x-6
    1000（1-x）²=640
     n^2+8n-15=0
    0.068s^3+3.91s^2+74.8s+170=0
    x^2*0.126—0.51*x—94.478=0
    (0.9247^x)*4.9+1.1=3.3
    (1-x^21)/(1-x) = 2.5*21/4.9
    (1-x^21)/(1-x)=2.5*21/6
    x/20+x/30+x/42＝3
    sin(x)/x=0.5
    sin(x)/x=0.5
    x²-3√3×√35x/7+4＝0
    4x²+64/4+x
    x²-10x+26.25＝0
    (X+2)÷4－（2x－3）÷6＝1＋x
    2x²÷(1-x²)=0.0000000081
    ((1+0.5*((397.5+0.3*x)*1.882528177*10^-3)^2)^-0.5)*(0.3+0.7*exp(-0.378*((397.5+0.3*x)*1.882528177*10^-3)^6)) =(397.5+0.3*x)*1.752791873*10^-3
    4x^2+3x-4=0

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