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D( x )
x-50 = 0
x-50 = 0
x-50 = 0
x-50 = 0 // + 50
x = 50
x in (-oo:50) U (50:+oo)
x = 600/(x-50) // - 600/(x-50)
x-(600/(x-50)) = 0
x-600*(x-50)^-1 = 0
x-600/(x-50) = 0
(x*(x-50))/(x-50)-600/(x-50) = 0
x*(x-50)-600 = 0
x^2-50*x-600 = 0
x^2-50*x-600 = 0
x^2-50*x-600 = 0
DELTA = (-50)^2-(-600*1*4)
DELTA = 4900
DELTA > 0
x = (4900^(1/2)+50)/(1*2) or x = (50-4900^(1/2))/(1*2)
x = 60 or x = -10
(x+10)*(x-60) = 0
((x+10)*(x-60))/(x-50) = 0
((x+10)*(x-60))/(x-50) = 0 // * x-50
(x+10)*(x-60) = 0
( x+10 )
x+10 = 0 // - 10
x = -10
( x-60 )
x-60 = 0 // + 60
x = 60
x in { -10, 60 }
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