190/x - 190/(x+50) = 38/60
190(x+50)*60 - 190x*60 = 38x(x+50)
11400x + 570000 - 11400x = 38x² + 1900x
38x²+1900x-570000=0
x² + 50x - 15000=0
(x-100)(x+150)=0
x=100或-150
190/x - 190/(x+50) = 38/60
38*5/x - 38*5/(x+50) = 38/60
5/x - 5/(x+50) = 1/60
300(x+50) - 300x = x(x+50)
15000 = x^2 + 50x
x^2 +50x -15000 = 0
(x+150)(x-100) = 0
x=-150或x=100
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