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D( x )
3*x-9 = 0
3*x-9 = 0
3*x-9 = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x in (-oo:3) U (3:+oo)
x = (2*x+7)/(3*x-9) // - (2*x+7)/(3*x-9)
x-((2*x+7)/(3*x-9)) = 0
(-1*(2*x+7))/(3*x-9)+x = 0
(-1*(2*x+7))/(3*x-9)+(x*(3*x-9))/(3*x-9) = 0
x*(3*x-9)-1*(2*x+7) = 0
3*x^2-11*x-7 = 0
3*x^2-11*x-7 = 0
3*x^2-11*x-7 = 0
DELTA = (-11)^2-(-7*3*4)
DELTA = 205
DELTA > 0
x = (205^(1/2)+11)/(2*3) or x = (11-205^(1/2))/(2*3)
x = (205^(1/2)+11)/6 or x = (11-205^(1/2))/6
(x-((11-205^(1/2))/6))*(x-((205^(1/2)+11)/6)) = 0
((x-((11-205^(1/2))/6))*(x-((205^(1/2)+11)/6)))/(3*x-9) = 0
((x-((11-205^(1/2))/6))*(x-((205^(1/2)+11)/6)))/(3*x-9) = 0 // * 3*x-9
(x-((11-205^(1/2))/6))*(x-((205^(1/2)+11)/6)) = 0
( x-((11-205^(1/2))/6) )
x-((11-205^(1/2))/6) = 0 // + (11-205^(1/2))/6
x = (11-205^(1/2))/6
( x-((205^(1/2)+11)/6) )
x-((205^(1/2)+11)/6) = 0 // + (205^(1/2)+11)/6
x = (205^(1/2)+11)/6
x in { (11-205^(1/2))/6, (205^(1/2)+11)/6 }
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