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    4.58*(1-X^6)/(1-X)=27.48
    81×100÷x÷1.05÷90×100=129
    26×100÷x÷1.05÷90×100=42
    1958636+x*8*385=1524600+(350-x)*8*385
    1013286+831600+4*x*385=(350-x)*4*385+1524600
    682500+1013286+831600+(350-x)*4*385=4*x*385+1524600
    682500+1013286+831600+4*x*385=(350-x)*4*385+1524600
    682500+1013286+831600+8*x*385/2=(350-x)*8*385/2+1524600
    682500+1013286+831600+8*x*385=(350-x)*8*385+1524600
    29×100÷x÷1.05÷90×100=42
    2261.8*511+180*x*385+700*150*6.5=22*180*385+180*(12-x)*385
    2261.8*511+180*x*385+700*150*6.5=22*180*439+180*(12-x)*385
    2X+1=(1/2)X+4
    2X+1=1/2X+4
    2261.8*448+180*x*385+700*50*6.5=22*180*385+180*(12-x)*385
    2261.8*448+180*x*385=22*180*385+180*(12-x)*385
    s^2+3s+3.25=0
    [(1.55*15*0.85-20.58)*x+(1.55*15*0.85*0.6-20.58)*(1-x)]=0
    2x²-14x+25
    1.48x+x=1

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