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    30000/x+80000/(x+60)=550
    30000/x+90000/(x+60)=550
    30000/x+60000/(x+60)=450
    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

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