8x²+0.4416x+0.517632 = 0
    8x²+0.4416x-0.517632=0
    X×100-4 x=41+x
    1/5x-2=0.5
    8x²-13.7464x+4.495259 = 0
    120+2x+2（1/2x+5）=1120
    8x²-0.00137464x+0.00000004495259 = 0
    x*x*x-45*x*x+648*x-2916=0
    8x²-0.00137464x+0.00000004495259=0
    1/5x-2=0.5
    (4/5+3.2)x=2/3
    60x=240(4.5+x)
    60x=4.5+x
    240x/（x+4.5)=240
    240x/（x-4.5)=240
    240x/（x-4.5)=240
    128/（x+1）=2(x+1)
    t+2=2t-4
    128/x+1=2(x+1)
    x²-7x+12=0

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