13769.56+154.64+0.0672x+0.1x=x
    3x^2-6x=1
    2.254=1079.8/(1074.8-x)
    2.254 = x/（1015.3-600.6）
    2.254=x/（1015.3-600.6）
    2.275=x/(955.1-613.8)
    2.275=x/(955.1-613.8)
    x^2+(x+√3x)^2=(√6+√2)^2
    2.266=1112.3/(1118.3-x)
    2.266=990.5/(x-625.5)
    4X+4X-6=50
    1700+50x
    （6-x）（400×1.25+40x）=1920
    （6-x）（400×1.25+40x）
    （14-8-x）（400-40x）=1920
    t*(8-2t)/2＝2
    t(4-t)=2
    90x+80(100-x)=8350
    x*0.1+(x+(x*0.1))*0.09+(x*0.1+(x+(x*0.1))*0.09)*0.09=498.96
    x*0.1+(x+(x*0.1))*0.09+(x*0.1+(x+(x*0.1))*0.09)*0.09

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