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D( x )
2*x-17 = 0
2*x-17 = 0
2*x-17 = 0
2*x-17 = 0 // + 17
2*x = 17 // : 2
x = 17/2
x in (-oo:17/2) U (17/2:+oo)
-33/(2*x-17) = x // - x
-33/(2*x-17)-x = 0
(-x*(2*x-17))/(2*x-17)-33/(2*x-17) = 0
-x*(2*x-17)-33 = 0
17*x-2*x^2-33 = 0
17*x-2*x^2-33 = 0
17*x-2*x^2-33 = 0
DELTA = 17^2-(-33*(-2)*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-17)/(-2*2) or x = (-25^(1/2)-17)/(-2*2)
x = 3 or x = 11/2
(x-3)*(x-11/2) = 0
((x-3)*(x-11/2))/(2*x-17) = 0
((x-3)*(x-11/2))/(2*x-17) = 0 // * 2*x-17
(x-3)*(x-11/2) = 0
( x-11/2 )
x-11/2 = 0 // + 11/2
x = 11/2
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 11/2, 3 }
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