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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(2*x+4)/2-((3*x)/(x-4)) = 0
(2*x+4)/2-3*x*(x-4)^-1 = 0
(2*x+4)/2+(-3*x)/(x-4) = 0
((2*x+4)*(x-4))/(2*(x-4))+(-3*2*x)/(2*(x-4)) = 0
(2*x+4)*(x-4)-3*2*x = 0
2*x^2-10*x-16 = 0
2*x^2-10*x-16 = 0
2*(x^2-5*x-8) = 0
x^2-5*x-8 = 0
DELTA = (-5)^2-(-8*1*4)
DELTA = 57
DELTA > 0
x = (57^(1/2)+5)/(1*2) or x = (5-57^(1/2))/(1*2)
x = (57^(1/2)+5)/2 or x = (5-57^(1/2))/2
2*(x-((5-57^(1/2))/2))*(x-((57^(1/2)+5)/2)) = 0
(2*(x-((5-57^(1/2))/2))*(x-((57^(1/2)+5)/2)))/(2*(x-4)) = 0
(2*(x-((5-57^(1/2))/2))*(x-((57^(1/2)+5)/2)))/(2*(x-4)) = 0 // * 2*(x-4)
2*(x-((5-57^(1/2))/2))*(x-((57^(1/2)+5)/2)) = 0
( x-((5-57^(1/2))/2) )
x-((5-57^(1/2))/2) = 0 // + (5-57^(1/2))/2
x = (5-57^(1/2))/2
( x-((57^(1/2)+5)/2) )
x-((57^(1/2)+5)/2) = 0 // + (57^(1/2)+5)/2
x = (57^(1/2)+5)/2
x in { (5-57^(1/2))/2, (57^(1/2)+5)/2 }
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