30000/(x+60) = 10000/70
    40000/(x+60) = 10000/70
    x（10-0. 2x) +(50-x）（10-0. 2x) (0. 5) =100
    40000/(x+60） = 10000/70
    240x+12000 = x*x
    5t^2+（25-2.5t）t=100
    36000x+1800000 = 150x*x
    10000(x+60)+30000x = 150x(x+60)
    5t^2+（50-5t）t=100
    10000/x+30000/(x+60) = 150
    10000/x+20000/(x+60) = 150
    10000/70(x+60)+(150-10000/70)x = 26000
    10000/70(x+60)+(150-10000/70)x = 36000
    1/2ln(1+e∧2x)
    3Q²－8Q＋100=135
    x²-800x+145600=0
    -8/9x^2-4x-4=0
    2(x+1)+(x-2)/3=7x/2-1
    (1+2x)/3+(x-2)=x-1
    n^2＋58n－2400＝0

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