x+0.03x=1421367.41
    x+0.09x=1421367.41
    19=x+x^2+x^3+21x^4
    4x^2+24 x- 108=0
    X=2X+18
    -2X-4=12
    0.0002*(0.01 - a) = a^2
    x(sinx)∧2
    x^2-0.736x+0.368=0
    tanx-x＝0.01758866
    n（n+2）=110
    x+0.03x=1419880.81
    x+0.09x=1419880.81
    2.25%（1-x）²=1.96%
    x+0.09x=1416042.15
    lnx/x-1
    （40+x-30）（300-10x ）=3360
    （40+x-30）（300-10）x =3360
    20*x*log(2,x)=50000000
    20*x*log(2,x)/100000000=0.5

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