x=(0.5x-5)*0.03+(0.5x-5)*0.97*0.2+10+80+0.5x
    x^3+5x^2+4x+4=0
    (y-30)(500-10y+400)=8000
    (y-30)(500-10y+400)
    25×x^2+50x-11 = 0
    √1-x -1 ＝√4-x
    y=(y-5)*0.03+(y-5)*0.97*0.2+25+100+55+y
    y=(y-5)*0.03+(y-5)*0.97*0.2+25+100+55+y
    y=(y-5)*0.03+(y-5)*0.97*0.2+25+100+55+y
    x=(0.5x-5)*0.03+(0.5x-5)*0.97*0.2+25+100+55+0.5x
    x^2=10.6/1.3
    20(1-X)^2=16.2
    ｛100*【（1+x）^10-1】｝/【x+（1+x）^10】+7000*（1+x）^（-10）=5000
    x/(2+x)
    （1+x/3）3=1％
     2 { x }^{ 4 } = 4x+8
    arctan1/x
    20(1+y)y+40(1+2y)y=20(1+y)+40(1+2y)+100
    20(1+y)²+40(1+2y)²=20(1+y)+40(1+2y)+100
    (40-2x)²=484

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