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    15x^2-1920x-60000=0
    15x^2-1860x-60000=0
    192-28m=10.4m^-166.4m+1206.4
    0.65=(34.6-1.4m)/(0.8m^-12.8m+92.8)
    0.65=(34.6-1.4m)/(0.8m^-12.8m+92.8)
    x/(x-269)=1.6
    225/(225-x)=1.8
    50000=(100-x)*1800-50000
    50000=(x-50)*1800-50000
    50000=1800-50000*(x-50)
    x-(x*0.46%)=188825
    arc(0.026816)
    arc 0.026816
    arc0.026816
    2arctg1.5361
    arctg1.5361
    (3000-x)/x=0.72
    3000-x/x=0.72
    3(3x^2+1+6x)/((1+x)^2)=1.8
    x*6+x*0.5=30702

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