56*-580-400-(56x*13%-5x)*12%=0
    56*-580-40*-(56x*13%-5x)*12%=0
    56x-580-40x-(56xx13%-5x)x12%=0
    x/x+100=0.12
    8000/x+1.5=5000/x
    441.14×（1-x）+60=310
    381=441.14×(1-x)+60
    381=441.14×(1-x)+60
    310=441.14×(1-x)+60
    （8-2x）（10-x）=54
    x＾6+10025x＾4+250000x＾2-506250000=0
    34x+xx=71120
    sin(x+0.5*sin(x))=0
    sin(x+sin(x))=0
    sin(x+sin(x))=0
    6x（5+6）+5x=225
    2400x＾2-750x-900=0
    x×x－3-2×sinx-3×cosx＝0
    (1+x% ) ^3=1.331
    arctan(2x)-arctan(0.1x)-arctan(0.2x)-arctan(26x)=-π/2

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