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D( x )
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
x in (-oo:4/3) U (4/3:+oo)
x = 1/(3*x-4) // - 1/(3*x-4)
x-(1/(3*x-4)) = 0
x-(3*x-4)^-1 = 0
x-1/(3*x-4) = 0
(x*(3*x-4))/(3*x-4)-1/(3*x-4) = 0
x*(3*x-4)-1 = 0
3*x^2-4*x-1 = 0
3*x^2-4*x-1 = 0
3*x^2-4*x-1 = 0
DELTA = (-4)^2-(-1*3*4)
DELTA = 28
DELTA > 0
x = (28^(1/2)+4)/(2*3) or x = (4-28^(1/2))/(2*3)
x = (2*7^(1/2)+4)/6 or x = (4-2*7^(1/2))/6
(x-((4-2*7^(1/2))/6))*(x-((2*7^(1/2)+4)/6)) = 0
((x-((4-2*7^(1/2))/6))*(x-((2*7^(1/2)+4)/6)))/(3*x-4) = 0
((x-((4-2*7^(1/2))/6))*(x-((2*7^(1/2)+4)/6)))/(3*x-4) = 0 // * 3*x-4
(x-((4-2*7^(1/2))/6))*(x-((2*7^(1/2)+4)/6)) = 0
( x-((2*7^(1/2)+4)/6) )
x-((2*7^(1/2)+4)/6) = 0 // + (2*7^(1/2)+4)/6
x = (2*7^(1/2)+4)/6
( x-((4-2*7^(1/2))/6) )
x-((4-2*7^(1/2))/6) = 0 // + (4-2*7^(1/2))/6
x = (4-2*7^(1/2))/6
x in { (2*7^(1/2)+4)/6, (4-2*7^(1/2))/6 }
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