1.3x+2.9*(22-x)=51
    1.3x+2.9*(22-x)
    2x+4(35-x)=9
    x(10-x)=5/4
    2.4^n = 15
    sqrt(1-a^2)=4*a^3-3*a
    sqrt(1-a^2)=4*a^3-3*a
    (x-2) ^3=2
    0.91*x=1.15*x+38
    0.91*x=1.15*x+38
    0.91*x+38=1.15*x
    a×ln（32.4/a）-1050/1500=0
    e^a=（1.1）^3
    e^c=1.3
    5b^2+10b-3=0
    5b^2+10b-3=0
    5b2+10b-3=0
    0.01（5000000+x）=110000+0.006x
    x=1.2x3
    cosx+12sinx/x=0

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