(x)=x^2+5x+4
    （233.1-0.518x）/（450-x）=0.518
    0.130682/x＝0.1289/0.86289
    0.4/100.58＝x/32.86
    （26.813+x）×2.95＝53.627+72.58-x
    5y=16y
    x+sin2x
    x=tan x
    x(lnx-1)=3
    x(lnx-1)=0
    x^3+x^2+2+x^11+e^sin√-1x=0
    x^3+x^2+2+x^11+e^sinx=0
    x^3+x^2+2=0
    x^3+x^2+2
    -t＾2+24t+1=0
    lgx=0.81
    14.5×10^7=13.8×200x(435-x/2)
    50%=-30.019x²+56.518+24.998
    50%=-30.019x2+56.518+24.998
    （x-3.44）/x=0.3273

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