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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/x-(7/6))/x-6 = 0
(7/x-7/6)/x-6 = 0
(7*x^-1-7/6)/x-6 = 0
(7*x^-1-7/6)/x+(-6*x)/x = 0
7*x^-1-6*x-7/6 = 0
7*x^-1-6*x-7/6 = 0
7*x^-1-6*x^1-7/6*x^0 = 0
(7*x^0-6*x^2-7/6*x^1)/(x^1) = 0 // * x^2
x^1*(7*x^0-6*x^2-7/6*x^1) = 0
x^1
(-7/6)*x-6*x^2+7 = 0
(-7/6)*x-6*x^2+7 = 0
DELTA = (-7/6)^2-(-6*4*7)
DELTA = 6097/36
DELTA > 0
x = ((6097/36)^(1/2)-(-7/6))/(-6*2) or x = (-(-7/6)-(6097/36)^(1/2))/(-6*2)
x = ((6097/36)^(1/2)+7/6)/(-12) or x = (7/6-(6097/36)^(1/2))/(-12)
x in { ((6097/36)^(1/2)+7/6)/(-12), (7/6-(6097/36)^(1/2))/(-12)}
(x-(((6097/36)^(1/2)+7/6)/(-12)))*(x-((7/6-(6097/36)^(1/2))/(-12))) = 0
((x-(((6097/36)^(1/2)+7/6)/(-12)))*(x-((7/6-(6097/36)^(1/2))/(-12))))/x = 0
((x-(((6097/36)^(1/2)+7/6)/(-12)))*(x-((7/6-(6097/36)^(1/2))/(-12))))/x = 0 // * x
(x-(((6097/36)^(1/2)+7/6)/(-12)))*(x-((7/6-(6097/36)^(1/2))/(-12))) = 0
( x-(((6097/36)^(1/2)+7/6)/(-12)) )
x-(((6097/36)^(1/2)+7/6)/(-12)) = 0 // + ((6097/36)^(1/2)+7/6)/(-12)
x = ((6097/36)^(1/2)+7/6)/(-12)
( x-((7/6-(6097/36)^(1/2))/(-12)) )
x-((7/6-(6097/36)^(1/2))/(-12)) = 0 // + (7/6-(6097/36)^(1/2))/(-12)
x = (7/6-(6097/36)^(1/2))/(-12)
x in { ((6097/36)^(1/2)+7/6)/(-12), (7/6-(6097/36)^(1/2))/(-12) }
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