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