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    lgx=3.45
    x^2/(0.5-x)=0.000018
    40²+x²=30²+(70-x)²
    -0.44 x^2-3.84x+9.8
    -0.44 x^2-9. 6x+9. 8
    (x-30)(3x-60)=1800
    (x-37)(70-2x)=2590
    (x-1.2)^2+2.56=x^2
    x^2+1.6^2=(1.2+x)^2
    X^2-12 x- 32=0
    X^2-10 x- 32=0
    (24sin2b+3cos2b- 3√3cos2b)*(√3sin2b-1+cos2b)=(30-24cos2b+3sin2b-3√3sin2b)*(√3cos2b-sin2b)
    (24sin2b+3cos2b- 3√3cos2b)*(√3sin2b-1+cos2b)=(30-24cos2b+3sin2b-3√3sin2b)*(√3cos2b-sin2b)
    100*300+(100-x)(300+2x)+50(400-2x)-60*1000=15200
    60000-[30000+(100-x)(300+2x)+50(400-2x)]=15200
    60000-(100-x)(300-2x)-100*300=15200
    60000-(100-x)(300-2x)-100*300=15200
    60000-(100-x)(300-2x)=15200
    3000+(100-x)(300-2x)+50(400-2x)-6000=15200
    x(80-2x)=350

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