x/22=600/25-4
    x/22=600/25+4
    (x-4)/22=600/25
    (x+4)/22=600/25
    125x^(2)-20x-57=0
    22x=600/25+4
    22x-4=600/25
    22x+4=600/25
    x-3=15/3*2
    2x-3=15/3
    56.6*4+24.8x=400
    56.6*4+x=400
    x*x+100*x+2=0
    (1.254*10^-14*k+1.0132*10^-10-1.65*10^-11)*(3.8*10^-8*k+3.3*10^-6-5*10^-5)-(10^-5*k+10)*3.3436*10^-17=0
    0.1718=-0.72x^2 + 1.6693x + 0.0247
    0.2903=-0.72x^2 + 1.6693x + 0.0247
    550/(x+110)-500/(x+100)=-2
    0.4486=-0.72x^2 + 1.6693x + 0.0247
    550/(x+110)-500/(x+100)=2
    0.6287=-0.72x^2 + 1.6693x + 0.0247

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