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D( x )
7*x = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
x in (-oo:0) U (0:+oo)
4/(7*x) = (6*x+1)/9 // - (6*x+1)/9
4/(7*x)-((6*x+1)/9) = 0
(-1*(6*x+1))/9+4/(7*x) = 0
(-1*7*x*(6*x+1))/(7*9*x)+(4*9)/(7*9*x) = 0
4*9-1*7*x*(6*x+1) = 0
36-42*x^2-7*x = 0
36-42*x^2-7*x = 0
36-42*x^2-7*x = 0
DELTA = (-7)^2-(-42*4*36)
DELTA = 6097
DELTA > 0
x = (6097^(1/2)+7)/(-42*2) or x = (7-6097^(1/2))/(-42*2)
x = (6097^(1/2)+7)/(-84) or x = (7-6097^(1/2))/(-84)
(x-((6097^(1/2)+7)/(-84)))*(x-((7-6097^(1/2))/(-84))) = 0
((x-((6097^(1/2)+7)/(-84)))*(x-((7-6097^(1/2))/(-84))))/(7*9*x) = 0
((x-((6097^(1/2)+7)/(-84)))*(x-((7-6097^(1/2))/(-84))))/(7*9*x) = 0 // * 7*9*x
(x-((6097^(1/2)+7)/(-84)))*(x-((7-6097^(1/2))/(-84))) = 0
( x-((6097^(1/2)+7)/(-84)) )
x-((6097^(1/2)+7)/(-84)) = 0 // + (6097^(1/2)+7)/(-84)
x = (6097^(1/2)+7)/(-84)
( x-((7-6097^(1/2))/(-84)) )
x-((7-6097^(1/2))/(-84)) = 0 // + (7-6097^(1/2))/(-84)
x = (7-6097^(1/2))/(-84)
x in { (6097^(1/2)+7)/(-84), (7-6097^(1/2))/(-84) }
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