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    (6-x)(400×1.25+40x)
    (14-8-x)(400-40x)=1920
    t*(8-2t)/2=2
    t(4-t)=2
    90x+80(100-x)=8350
    x*0.1+(x+(x*0.1))*0.09+(x*0.1+(x+(x*0.1))*0.09)*0.09=498.96
    x*0.1+(x+(x*0.1))*0.09+(x*0.1+(x+(x*0.1))*0.09)*0.09
    t(4-t)
    2t-t*t=1
    t=1/(2-t)
    x/2-(2-x)=1
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.123295)
    ln(x-1)
    12.16x=(3.5+x)×8.98
    12.32x=(3.5+x)×8.98
    (5x-600)/(x∧2-250+16900)∧0.5=-3
    3x/(x²+2500)∧0.5=5
    (140-X)/(ln((180-X)/40))=81.53
    (140-X)/(ln((180-X)/40))=97.836
    (140-X)/(ln((180-X)/40))

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