x/5+5.4=x-783
    783+x=10x-5
    783+x=10x-5
    1-3/2*x=3*x+5/2
    1/4*x=1/2*x+3
    1/4*x=1/2*x+3
    1/4*x=1/2*x+3
    1-x=5
    2x+1=8
    32x=0
    ax=3
    x=3
    x+7.64/（x^2） = 17.02
    x+27.58/（x^2） = 17.02
    x-27.58/（x^2） = 17.02
    x-27.58/x^2 = 17.02
    x+27.58/x^2=17.02
    x+4.78/x^2=17.02
    4/5+4/5x=6
    a×a+0.7

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