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    90-2arctan(x/10)=65
    1/x+1/(x+1)+1/(x+3)=1/(x+5)
    180-arctan2-xarctan0.2=0
    8*x+225/x=120
    11/87-.04-40/1650+X/126=0.00238(101+X)
    (500-480)/(540-480)=(x-4930)/(5440-4 930)
    1/(x^2+1)
    2x-1/3=-x/3+2
    566550000=14.3*600*x*(535-0.5*x)
    566550000=14.3*500*x*(535-0.5*x)
    4y-2=3-y
    566550000=14.3*300*x*(535-0.5*x)
    566550000=14.3*400*x*(535-0.5*x)
    18-0.5(2v/3+125/3/v-5)(2v/3+125/3/v-5)=v(2v/3+50/3/v-2)-1.25(2v/3+50/3/v-2)(2v/3+50/3/v-2)
    18-0.5(2v/3+125/3v-5)(2v/3+125/3v-5)=v(2v/3+50/3v-2)-1.25(2v/3+50/3v-2)(2v/3+50/3v-2)
    3/x=(1/(x+27.7))+1/(587.7)
    5.0465=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    4.8236=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    117*(x-500)+7*(x-1000)+218*x+33*(x+250-500)+(x+500/6-500)+(x+500/2-500)+(x-500)+x/2+(x-500)*8/12+(x-750)*6/12+(x-500)/6=5790724.49
    5.4147=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))

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