30/x - 30/x+20 = 1/4
600/(x^2+20x)=1/4
x^2+20x=2400
x^2+20x-2400=0
D=400+4*2400=100^2
x=(100-20)/2=40
x=-120/2=-60
30/x - 30/x+20 = 1/4
600/(x^2+20x)=1/4
x^2+20x=2400
x^2+20x-2400=0
D=400+4*2400=100^2
x=(100-20)/2=40
x=-120/2=-60