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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
3/(x-5) = (10/2)*x // - (10/2)*x
3/(x-5)-((10/2)*x) = 0
3/(x-5)-5*x = 0
3/(x-5)+(-5*x*(x-5))/(x-5) = 0
3-5*x*(x-5) = 0
25*x-5*x^2+3 = 0
25*x-5*x^2+3 = 0
25*x-5*x^2+3 = 0
DELTA = 25^2-(-5*3*4)
DELTA = 685
DELTA > 0
x = (685^(1/2)-25)/(-5*2) or x = (-685^(1/2)-25)/(-5*2)
x = (685^(1/2)-25)/(-10) or x = (685^(1/2)+25)/10
(x-((685^(1/2)-25)/(-10)))*(x-((685^(1/2)+25)/10)) = 0
((x-((685^(1/2)-25)/(-10)))*(x-((685^(1/2)+25)/10)))/(x-5) = 0
((x-((685^(1/2)-25)/(-10)))*(x-((685^(1/2)+25)/10)))/(x-5) = 0 // * x-5
(x-((685^(1/2)-25)/(-10)))*(x-((685^(1/2)+25)/10)) = 0
( x-((685^(1/2)+25)/10) )
x-((685^(1/2)+25)/10) = 0 // + (685^(1/2)+25)/10
x = (685^(1/2)+25)/10
( x-((685^(1/2)-25)/(-10)) )
x-((685^(1/2)-25)/(-10)) = 0 // + (685^(1/2)-25)/(-10)
x = (685^(1/2)-25)/(-10)
x in { (685^(1/2)+25)/10, (685^(1/2)-25)/(-10) }
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