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    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
    7.5*x*600*1000000+210000*188/x*(x-55)*1077=218000*188/x*(90-x)*1500+218000*188/x*(350-x)*1500
    7.5*x*600*1000000+210000*166/x*(x-55)*1077=218000*166/x*(90-x)*1500+218000*166/x*(350-x)*1500
    7.5*x*600*1000000+210000*166/x*(x-55)*1077=210000*166/x*(90-x)*1500+210000*166/x*(350-x)*1500
    7.5*x*600*1000000+210000*166/x*(x-55)*1077+210000*166/x*(x-90)*1500=210000*166/x*(350-x)*1500
    7.5*0.5*x*600*1000000+210000*166/x*(x-55)*1077+210000*166/x*(x-90)*1500=210000*166/x*(350-x)*1500
    7.5*80*600+210000*166/x*(x-55)*1077+210000*166/x*(x-90)*1500=210000*166/x*(350-x)*1500
    7.5*x*600+210000*166/x*(x-55)*1077+210000*166/x*(x-90)*1500=210000*166/x*(350-x)*1500
    7.5*x*600+210000*166/x*(x-55)*1077=210000*166/x*(90-x)*1500+210000*166/x*(350-x)*1500
    7.5*0.5*x*600+210000*166/x*(x-55)*1077=210000*166/x*(90-x)*1500+210000*166/x*(350-x)*1500

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