2xxx-3xx=-3
    2xxx-3xx=5
    2xxx-3xx=11
    2*x*x*x-3*x*x=9
    (x-3)*(x+3)*(x-6)=5
    x^2+16=【(4√5)-x】^2
    x^2-9x+16=0
    8x^2-33x+32=0
    x^2=9
    8x^2-33x+8=0
    14.711=（（0.021*x^1.85+557）^0.5）*x^0.84
    5.01=（（0.021*x^1.85+557）^0.5）*x^0.84
    (x-115.185)*10-2=1
    (x-122.617)*10-2=1
    x^2-6.7x+10.7=0
    （220*63-x）*0.95=11756
    （220*63-x）*0.85=11756
    (x-1000)/1000/-10%=-0.5
    （x-1000)/-10%=-0.5
    0.131/x＝0.1289/0.86289

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