0.36*2y
    0.36*2y=
    X/1.01*0.01+（50000-X)/1.13*0.13=4128.44
    X/1.01*0.01+（50000-X)/1.13*0.13=4128.44
    x/0.09+(57803.41-x)/0.13=479138.15
    x/0.09+(8974.37-x)/0.13=74977.74
    x/0.09+(53803.76-x)/0.13=459308.91
    x/0.09+(21.96-x)/0.13=200.54
    x/0.09+（9218.11-x）/0.13=92717.02
    8:5=20:x
    5:20=8:x
    25-x^2=(x-sqrt(9-sqrt(16-x^2))^2
    86/100×x+7=92/100×x+4
    86/100×（x-7）=92/100×（x-4）
    13.8*500*x（460-x/2）=2×10^7
    13.8+500×x（460-x/2）=2×10^7
    tanx-x
    tanx－x
    34a+7（26-a）=900
    8.5*x*600*1000000+210000*188/x*(x-55)*1077=218000*188/x*(90-x)*1500+218000*188/x*(350-x)*1500

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