3x²+5x-12＝0
    x²-8x+12＝0
    x²+x-12＝0
    x²+x-12＝0
    x²-x-12＝0
    x²-x112＝0
    x²-7x+6＝0
    x²+7x+12＝0
    x²-5x-6＝0
    147000000=13.8*200x（460-x/2）
    x²-6x+9＝0
    x*x-920x+53261*2=0
    x*x-920x+53261x2=0
    x*x-920x+53261x2=0
    x²-6x-5＝0
    94206c-20566c（-2993c+299902c）-20567=22482
    x+(x+5)+(x-1)=19
    x+(x-1)+(x+5)=19
    X-2x+1/12=1-3x-2／4
    x*x-920x+53261=0

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