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    √(x^2+4)+√((6-x)^2+16)=√13
    900*X-656*X-5*X-1200=0
    xe^(x-2)
    e^(x-2)
     1.25*1.2-1.35x = 2-2x
     1.25(1.2-1.35x) = 2-2x
     1.2(1.2-1.35x) = 2-2x
    2X-18=X+16
    1X+16=2X-18
    1X+16=2X-18
    12x+4=8*(x+2)
    12x+4=8*(x+4)
    12x+4=8*(4+x)
    sqrt(1-x)+sqrt(2)*x=x
    2b-(20-b)=4
    x^3-x^2-x+1=0
    8s^3+7s^2+s+2=0
    w*w*(0.1*w*0.1*w+1)*(0.5*0.5*w*w+1)=100
    90-arctanw-arctan0.5w=43
    arctanw+arctan0.5w=0.5π

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