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    0.142=x*0.085+0.18*(1-x)
    -11200+x-x*0.1=100
    1.2*794/(x+794)=794/(x*0.68+794)
    0.142=x*0.085+x*0.18
    (X+3)(X-4)-(X-1)
    k^3-k^2+1=0
    (X-1280)*(1-25%)/4000=(X-1280-540)*(1-25%)/5250
    tsn45
    X(1-60%)-2500=1415
    arctanx=1
    4/x-9/x+1
    4/x-9/(x+1)=0
    4/x-9/x+1=0
    (x-0.19)/0.01
    (0.19-x)/(0.2-0.19)=(0.08-0)/(-0.28-0.08)
    (19%-x)/(20%-19%)=(0.08-0)/(-0.28-0.08)
    (20%-x)/(20%-19%)=(-0.28-0)/(-0.28-0.08)
    m(-2m+72)=650
    m(-2m+72)=640
     45+x=129

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