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    56.6(x+7.98)-(x-7.98)^(2)=550
    56.6(x+7.98)-(x-7.98)^(2)=274
    1/d+1/(d+2)+1/(d+3)=1/(d-1)
    (1+x )^10=2
    40+x=120
    79(x+7.98)-(x-7.98)^(2)=390
    56.6(x+7.98)-(x-7.98)^(2)=390
    5x+1=11
    56.6(x+17.72484872)-(x-17.72484872)^(2)=390
    5y+(1200-y)*15=(25y+45*(1200-y))*0.3
    0.3*x=0.5*(0.3+x)
    x^2 +2*x-0.1025=0
    56.6(x+17.72484872)-(x-17.72484872)^(2)=720
    (4500*12*0.9-60%*70A*(4.9%+2%))/(40%*70A+5%*7A)=3.8%
    (4500*12*0.9-60%*70X*(4.9%+2%))/(40%*70X+5%*70X)=3.8%
    56.6(x+17.72484872)-(x-17.72484872)^(2)=574.117
    0.45X^2-450X=0
    X^2-3X=0
    2x+3(13-x)=31
    (2-x)(1-x)(-x)+8x-8=0

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