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
    1+(x-3)/3=(3x+2)/4
    2x/3-(2x+1)/6=1
    2-X/3=(4x-1)/2
    (1+2X)/3=X-1
    7-3/2x=1-2/3x

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