(168+x)/(48+300-x)= 2.125
    (168+x)/(48+250-x)= 2.125
    (168+x)/(48+220-x)= 2.125
    (168+x)/(48+200-x)= 2.125
    (168+x)/(48+150-x)= 2.125
    1000000-1000=-29700x-279x*x+x*x*x
    400x^2-400x^4-1=0
    12.22x^2-12.22x^4-1=0
    94.09x^2-94.09x^4-1=0
    r*r/100*43/10=0.366*44*24*lg(r/0.175)
    r*r/100*43/5=0.366*44*24*lg(r/0.175)
    r*r/100*43/12=0.366*44*24*lg(r/0.175)
    r*r/100*43/15=0.366*44*24*lg(r/0.175)
    r*r/100*43/27=0.366*44*24*lg(r/0.175)
    r*r/100*117/20=0.366*45*24*lg(r/0.175)
    r*r/100/117*20=0.366*45*24*lg(r/0.175)
    r*r/100/117*15=0.366*45*24*lg(r/0.175)
    x^2+6x-720=0
    x^2+6x+720=0
    r*r/100/12*43=0.366*44*24*lg(r/0.175)

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