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    0.45*11*a+(0.45+0.36)/2*11*(8-a)=34.98
    2x + 3 = 7
    (260*63-X)*0.95=12964.15
    x+sqrt(8-x^2)=sqrt(16-x^2)
    (3.2-0.8)*x=3.2*x-0.8*x
    610/1235=X/(0.1+X)
    610/1235=X/1.1X
    5x-26=432
    (x+15)(35+3x)=1000
    ((4/7)*x*(2/5))/(1/14)-60
    11(a+1)^2+5(a-1)^2=20
    -0.01(x-30)^2+9=5
    36+(16-5x)(16-5x)=100
    (X-14248288.98)/X=0.3
    b^4-50b^2-150b-225=0
    2.25-5x+xx=0
    sinx-2.383x+1.152π=0
    b^4+6b^3-41b^2-150b-225=0
    2x^2-13x+21=0
    4x^2+17x-21=0

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