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    2x^3+11x^2+20x+8=0
    x^2-x-1=0
    x^2-x+1=0
    x(x+2)=3x+6
    -90-arctanx/20-arctanx/2=-180
    arctanx/20+arctanx/2=90
    x+3/x=6
    x^3+2x^2-7x-10=0
    (0.8-0.02x2)x(2-0.02)+(10-0.02x2)x(2.1-0.02)x14+(0.9-0.02)x2x(21-0.02)x8+(1.5-0.02x2)x2+(2.4-0.02x2)x(3.0-0.02)
    (0.8-0.02x2)x(2-0.02)+(10-0.02x2)x(2.1-0.02)x14+(0.9-0.02)x2x(21-0.02)x8+(1.5-0.02x2)x2+(2.4-0.02x2)x(3.0-0.02)=
    x÷8-x÷12=12
    4x²-36x+96
    12x²-72x+96
    (-1)*90-arctan(x)+arctan(0.507*x)-arctan(0.078*x)=-1*180
    -90-arctan(x)-arctan(0.078*x)+arctan(0.507*x)=-180
    11280.15=(220*63-x)*0.95+8*63
    arctan(0.2*x)+arctan(0.01*x)=60
    x²+1/x²
    4.3188=((30.56*0.847(x+0.1))/(1+0.847(x+0.1))*((100-8.28-1.4)/100)*(1/(1+0.31*1.4)+((2.26(x+0.1))/(1.3*0.101325))
    3.6904=((30.56*0.847(x+0.1))/(1+0.847(x+0.1))*((100-8.28-1.4)/100)*(1/(1+0.31*1.4)+((2.26(x+0.1))/(1.3*0.101325))

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