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D( x )
7*x-6 = 0
7*x-6 = 0
7*x-6 = 0
7*x-6 = 0 // + 6
7*x = 6 // : 7
x = 6/7
x in (-oo:6/7) U (6/7:+oo)
(12*x^2-(5*x)-8)/(7*x-6) = 0
(12*x^2-5*x-8)/(7*x-6) = 0
12*x^2-5*x-8 = 0
12*x^2-5*x-8 = 0
DELTA = (-5)^2-(-8*4*12)
DELTA = 409
DELTA > 0
x = (409^(1/2)+5)/(2*12) or x = (5-409^(1/2))/(2*12)
x = (409^(1/2)+5)/24 or x = (5-409^(1/2))/24
(x-((5-409^(1/2))/24))*(x-((409^(1/2)+5)/24)) = 0
((x-((5-409^(1/2))/24))*(x-((409^(1/2)+5)/24)))/(7*x-6) = 0
( x-((409^(1/2)+5)/24) )
x-((409^(1/2)+5)/24) = 0 // + (409^(1/2)+5)/24
x = (409^(1/2)+5)/24
( x-((5-409^(1/2))/24) )
x-((5-409^(1/2))/24) = 0 // + (5-409^(1/2))/24
x = (5-409^(1/2))/24
x in { (409^(1/2)+5)/24, (5-409^(1/2))/24 }
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