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D( x )
3*x-7 = 0
3*x-7 = 0
3*x-7 = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
x in (-oo:7/3) U (7/3:+oo)
(15*x^2-(23*x)-21)/(3*x-7) = 0
(15*x^2-23*x-21)/(3*x-7) = 0
15*x^2-23*x-21 = 0
15*x^2-23*x-21 = 0
DELTA = (-23)^2-(-21*4*15)
DELTA = 1789
DELTA > 0
x = (1789^(1/2)+23)/(2*15) or x = (23-1789^(1/2))/(2*15)
x = (1789^(1/2)+23)/30 or x = (23-1789^(1/2))/30
(x-((23-1789^(1/2))/30))*(x-((1789^(1/2)+23)/30)) = 0
((x-((23-1789^(1/2))/30))*(x-((1789^(1/2)+23)/30)))/(3*x-7) = 0
( x-((1789^(1/2)+23)/30) )
x-((1789^(1/2)+23)/30) = 0 // + (1789^(1/2)+23)/30
x = (1789^(1/2)+23)/30
( x-((23-1789^(1/2))/30) )
x-((23-1789^(1/2))/30) = 0 // + (23-1789^(1/2))/30
x = (23-1789^(1/2))/30
x in { (1789^(1/2)+23)/30, (23-1789^(1/2))/30 }
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