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    85%[200×(160-t)+250×(140+t)]-41000=95%t+85%(60-t)
    85%[200×(160-t)+250×(140+t)]-41000=95%t+85%(60-t)
    X/0.06×7=330-X/0.015
    (150-x)x=3600
    13a+84=134√(a^2-67^2)
    -x^2+3x+3
    x^3-6x^2+12x-1=0
    16-12x×x=0
    3x×x-4=0
    184.63/cos(22+x)=173.21/cos(30+x)
    184.63/cos(22+x)=173.21/cos(30+x)
    c/1
    c/1
    c/1
    (2x-1)/5+1=(x+1)/2
    2[2*(-6)-1]+1=5[(-6)+a]
    lnx=x
    [-200(16+a/2)+5000](16-7-a/2)-2000=12112
    16200-1800a+50a²=14114
    2n×n+n=171

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