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    a^3-7a^2+14a-7=0
    x(12-2x)/2=6
    x(26-2x)=80
    x(28-x)=160
    x(12-2x)=16
    x(12-2x)/2=8
    x(12-2x)=8
    (32-x)(20-x)=540
    (12-2x)=81
    (40-2x)(25-2x)=450
    1200=3.14*0.5*(30*4+40*3+50*2+80*x)+2200*3.14*0.25*0.25
    1200=3.14*0.5*(40*3+30+4+50+2+80*x)+2200*3.14*0.25*0.25
    x/4*3.14*6371000=16/3*10^8/1.2*10^29
    2.14-1.92/(1-x)
    (23+x)*0.65=50.63
    x(x+4)=2
    370400=8.314×300÷(x-0.0000806)-(27.24÷√300)÷x÷(x+0.0000806)
    (4.72-4.72/1.13*0.13+0.12)/7.0=X
    (5.71-5.71/1.13*0.13+0.14)/7.0=X
    (26.253+x)×2.55=52.306+69.859-x

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