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    216/(x+18)=72/(12-x)
    (cosx)^2
    (10-x)/x=0.66
    4.7516=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    4.7072=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    x^5−15x^4+85x^3−225x^2+274*x−121=0
    x^5−15x^4+85x^3−225x^2+274*x−121=0
    sqrt(x-1)+sqrt(2*x-3)+sqrt(3*x-5)+sqrt(4*x-7)=5*x-6
    sqrt(3)*2*x^3-7*x^2+3
    x^2-250x+10000=0
    sin5x-ln(x²)=π/2
    x^4+3x^3-2x^2+6x-7=0
    x²=2.6×(1-x)×(4-x)
    8x²-26x+13=0
    4.7415=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14)+((0.76(x+0.1))/(1.3*0.101325))
    4.7415=((19.457*0.634(x+0.1))/(1+0.634(x+0.1))*((100-17.84-1.23)/100)*(1/(1+0.31*1.23)+((3.76(x+0.1))/(1.427*0.101325))
    4.7415=((19.457*0.634(x+0.1))/(1+0.634(x+0.1))*((100-17.84-1.23)/100)*(1/(1+0.31*1.23)+((3.76(x+0.1))/(1.427*0.101325))
    (6.83-6.83/1.13*0.13+0.15)/6.79=x
    cosx^2-(20-2)cosx+14=0
    x^2-(20-2)x+14=0

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