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    20000/x+60000/(x+60)=350
    20000/x+50000/(x+60)=350
    16x*1.55=1.45x*18
    10000/x+50000/(x+60)=250
    10000/x+30000/(x+60)=150
    10000/x+30000/(x+60)=250
    20000/x+60000/(x+60)=250
    20000/x+50000/(x+60)=250
    20000/x+40000/(x+60)=250
    20000/x+30000/(x+60)=250
    10000/x+20000/(x+60)=150
    8000/(1.5+x)=5000/x
    4 x-X/1
    116/T=1.5lnT-9.2
    96+3x=138+4x
    96+3x=138-4x
    96+3x=128+4x
    1.5x-0.5+(5x-1)/3=2
    (2x-1)/3=1-0.5x+1
    x-1/3=1-2/3×x+1/6

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