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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
19*x-((7/(3*x-1))*(2*x-1)) = 0
19*x-7*(2*x-1)*(3*x-1)^-1 = 0
(-7*(2*x-1))/(3*x-1)+19*x = 0
(-7*(2*x-1))/(3*x-1)+(19*x*(3*x-1))/(3*x-1) = 0
19*x*(3*x-1)-7*(2*x-1) = 0
57*x^2-33*x+7 = 0
57*x^2-33*x+7 = 0
57*x^2-33*x+7 = 0
DELTA = (-33)^2-(4*7*57)
DELTA = -507
DELTA < 0
1 = 0
1/(3*x-1) = 0
1/(3*x-1) = 0 // * 3*x-1
1 = 0
x belongs to the empty set
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