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    1200/1.5x-600/x=40
    3600/x=2400/1500-x
    x^2+12x+100+40=x^2+100
    x^2+100+40=x^2+12x+100
    x^2+100+x^2+12x+100=40
    sqrt(x^2+100)+sqrt(40)=sqrt(x^2+12x+100)
    sqrt(x^2+100)+sqrt(x^2+12x+100)=sqrt(40)
    X-x/20=7.6
    X-x/20=7.6
    0.88x=x-39
    115.2/(X-115.2)=30%
    (x-20)*(1-0.25)/650=(x-300*0.12-200*0.1)*(1-0.25)/500
    X+5.6=9.4
    1.2X=81.6
    7.5×2X=15
    12X-8X=4.8
    X-0.8X=6
    3200=450+5X+X
    25000+X=6X
    2(X+X+0.5)=9.8

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