Mathematics
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    16*16-4*4*9=
    sqrt27+2^3
    7x+5=9x-2
    (5+x)×4=32
    log(2,0.74)
    36/x+x-4/8=x-40/2
    (tan60)^2
    atan60
    tan60
    x-4=(90-x+4)×80%
     e^(-0.029x) =0.45
    47.84+(-32.68)=
    41.24+(-4.83)=
    6.67×100×5.965x =100000000×1.5×4×3.14×3.14/((365×24×60×60)^2)
    6.67×100×5.965x=1.5×4×3.14×3.14/((365×24×60×60)^2)
    6.67×100×5.965×x=1.5×4×3.14×3.14/((365×24×60×60)^2)
    6.67×100×5.965×((330000/x)-(1/(1.5×10^11-x)))=1.5×4×3.14×3.14/((365×24×60×60)^2)
    6.67×100×5.965×(330000/x-1/(1.5×10^11-x))=1.5×4×3.14×3.14/((365×24×60×60)^2)
    6.67×100×5.965×(330000/x-1/(1.5×10^11-x))=1.5×4×3.14×3.14/(365×24×60×60)^2
    1/x-5=5

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