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    40(0.9x-x)=60(0.8x-x)
    2(30-2x)x+2(20-2x)x=200
    -100+x^2=25
    x^2-100x=25
    -100+8x^2=200
    8x^2-100x=200
    3.9148=((24.1*0.449(x+0.1))/(1+0.449(x+0.1))*((100-9.66-1.06)/100)*(1/(1+0.31*1.06)+((2.86(x+0.1))/(1.36*0.101325))
    ((x^3)^-2)=1000
    3.9148=((25.53*0.591(x+0.1))/(1+0.591(x+0.1))*((100-19.9-0.96)/100)*(1/(1+0.31*0.96)+((3.47(x+0.1))/(1.39*0.101325))
     X+75x-17500=0
    30y-y²=200
    30y-y²-200=0
    n^2-n=240
    30y-y²-200=0
    x+1/3x+2/7x+1/2x=33
    x+1/3x+2/7x+1/2x=33
    x+1/3x+2/7x+1/2x=33
    x+1/2x+2/7x+1/2x=33
    X+1.25*(14%-X)=15%
    4x-6=8

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