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    0.1=100x/(1+x)
    0.1=100x÷(1+x)
    20%x+(1-20%)x*30%=2200
    0.1=100x÷(1000+x)
    (x-25+10)×0.6/((x-25+10)×0.6+(180-x+15)×1.3)=24.6%
    (x-25+10)×0.6÷(x-25+10)×0.6+(180-x+15×1.3)=24.6%
    140=(4+x)(32-4x)
    (x-25+10)×0.6÷((x-25+10)×0.6+(180-x+15×1.3))=24.6%
    140=4(x-2)²+128
    (100-x)²+400=3600+x²
    5x²+2x-1=0
    4(3x-4)²=(4x-3)²
    12x^6+12x^5+12x^4+12x^3+12x^2+12x^1=24
    12x^6+12x^5+12x^4+12x^3+12x^2+12x^1=18
    500/(x-25)+30(x-25)/x=30
    (25-X(300-30x)=6300
    x3+21/100x+11/200=0
    0.2x+30=0.5x
    26*100/X/1.05/90*100=42
    49*100/X/1.05/90*100=78

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