Mathematics
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    1-(2x+3)=-3
    x+x
    1-e^(-5/21)
    e^(-20/7)+e^(-20/7)*20/7+e^(-20/7)*(20/7)^2/2+e^(-20/7)*(20/7)^3/6
    e^(-20/7)
    -40+4*(1-1.12^(-3))/0.12+4/(1.04^4)+24/(1.04^5)
    -40+20*(1-1.2^(-5))+20/(1.2^5)
    16*7
    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)=

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