t²-4t+2=0
    t²-4t+2=8
    2*x＾4－7*x＾2－15＝0
    2*x4－7*x2－15＝0
    2=6-m/m-2
    3x²-4x-2=0
    5(x-1)(x－1)＋5－5(x－0.25)(x－0.25)＝1.25
    5(x-1)(x－1)＋5－5(x－0.25)＝1.25
    5x＝2
    sin1x/2
    sin1/2x
    sinx
    sinπx/2
    sin2x/π
    sinx
    X-188=（1-45%）x
    1380xx-1269600x+159500000=0
    1380xx-1269600+159500000=0
    1380xx-1269600x+145000000
    xx-920x+66667=0

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