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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)
(8/(x-4))*(7*x+5)+x = 0
(8*(7*x+5))/(x-4)+x = 0
(8*(7*x+5))/(x-4)+(x*(x-4))/(x-4) = 0
8*(7*x+5)+x*(x-4) = 0
x^2+52*x+40 = 0
x^2+52*x+40 = 0
x^2+52*x+40 = 0
DELTA = 52^2-(1*4*40)
DELTA = 2544
DELTA > 0
x = (2544^(1/2)-52)/(1*2) or x = (-2544^(1/2)-52)/(1*2)
x = (4*159^(1/2)-52)/2 or x = (-4*159^(1/2)-52)/2
(x-((-4*159^(1/2)-52)/2))*(x-((4*159^(1/2)-52)/2)) = 0
((x-((-4*159^(1/2)-52)/2))*(x-((4*159^(1/2)-52)/2)))/(x-4) = 0
((x-((-4*159^(1/2)-52)/2))*(x-((4*159^(1/2)-52)/2)))/(x-4) = 0 // * x-4
(x-((-4*159^(1/2)-52)/2))*(x-((4*159^(1/2)-52)/2)) = 0
( x-((-4*159^(1/2)-52)/2) )
x-((-4*159^(1/2)-52)/2) = 0 // + (-4*159^(1/2)-52)/2
x = (-4*159^(1/2)-52)/2
( x-((4*159^(1/2)-52)/2) )
x-((4*159^(1/2)-52)/2) = 0 // + (4*159^(1/2)-52)/2
x = (4*159^(1/2)-52)/2
x in { (-4*159^(1/2)-52)/2, (4*159^(1/2)-52)/2 }
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