Mathematics
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    -5x^2+80x+400
    -5(x^2-16x)+400
    (4+0.4n)*(20-n)
    X^7+X^6+100X^3=1000
    x^3-3x^2-9x
    sin(1.6016x)=2.38 sin(0.8008x)=0.89
    sin(1.6016x)=2.37979 sin(0.8008x)=0.89
    sin(0.8008x)=0.89
    sinh0.8008=0.89
    0.5x+5=0.6x-75
    x^2-x+1=0
    8÷11[3÷4-(7÷18-0.25)]
    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

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